Update docs links to prefer HTTPS for supported domains (#6383)

* Update docs links to prefer HTTPS for supported domains

* Fix existing typos

Author: ianschmitz

docusaurus/docs/adding-bootstrap.md

@@ -32,7 +32,7 @@ import 'bootstrap/dist/css/bootstrap.css';
 Sometimes you might need to tweak the visual styles of Bootstrap (or equivalent package).<br>
 As of `[email protected]` you can import `.scss` files. This makes it possible to use a package's built-in Sass variables for global style preferences.
 
-To customize Bootstrap, create a file called `src/custom.scss` (or similar) and import the Bootstrap source stylesheet. Add any overrides _before_ the imported file(s). You can reference [Bootstrap's documentation](http://getbootstrap.com/docs/4.1/getting-started/theming/#css-variables) for the names of the available variables.
+To customize Bootstrap, create a file called `src/custom.scss` (or similar) and import the Bootstrap source stylesheet. Add any overrides _before_ the imported file(s). You can reference [Bootstrap's documentation](https://getbootstrap.com/docs/4.1/getting-started/theming/#css-variables) for the names of the available variables.
 
 ```scss
 // Override default variables before the import

docusaurus/docs/advanced-configuration.md

@@ -11,7 +11,7 @@ You can adjust various development and production settings by setting environmen
 | HOST                 |   ✅ Used   | 🚫 Ignored | By default, the development web server binds to `localhost`. You may use this variable to specify a different host.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
 | PORT                 |   ✅ Used   | 🚫 Ignored | By default, the development web server will attempt to listen on port 3000 or prompt you to attempt the next available port. You may use this variable to specify a different port.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
 | HTTPS                |   ✅ Used   | 🚫 Ignored | When set to `true`, Create React App will run the development server in `https` mode.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| PUBLIC_URL           | 🚫 Ignored  |  ✅ Used   | Create React App assumes your application is hosted at the serving web server's root or a subpath as specified in [`package.json` (`homepage`)](deployment#building-for-relative-paths). Normally, Create React App ignores the hostname. You may use this variable to force assets to be referenced verbatim to the url you provide (hostname included.md). This may be particularly useful when using a CDN to host your application.                                                                                                                                                                                                                                  |
+| PUBLIC_URL           | 🚫 Ignored  |  ✅ Used   | Create React App assumes your application is hosted at the serving web server's root or a subpath as specified in [`package.json` (`homepage`)](deployment#building-for-relative-paths). Normally, Create React App ignores the hostname. You may use this variable to force assets to be referenced verbatim to the url you provide (hostname included). This may be particularly useful when using a CDN to host your application.                                                                                                                                                                                                                                  |
 | CI                   |   ✅ Used   |  ✅ Used   | When set to `true`, Create React App treats warnings as failures in the build. It also makes the test runner non-watching. Most CIs set this flag by default.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
 | REACT_EDITOR         |   ✅ Used   | 🚫 Ignored | When an app crashes in development, you will see an error overlay with clickable stack trace. When you click on it, Create React App will try to determine the editor you are using based on currently running processes, and open the relevant source file. You can [send a pull request to detect your editor of choice](https://github.com/facebook/create-react-app/issues/2636). Setting this environment variable overrides the automatic detection. If you do it, make sure your systems [PATH](<https://en.wikipedia.org/wiki/PATH_(variable)>) environment variable points to your editor’s bin folder. You can also set it to `none` to disable it completely. |
 | CHOKIDAR_USEPOLLING  |   ✅ Used   | 🚫 Ignored | When set to `true`, the watcher runs in polling mode, as necessary inside a VM. Use this option if `npm start` isn't detecting changes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |

docusaurus/docs/alternatives-to-ejecting.md

@@ -3,4 +3,4 @@ id: alternatives-to-ejecting
 title: Alternatives to Ejecting
 ---
 
-[Ejecting](available-scripts.md#npm-run-eject) lets you customize anything, but from that point on you have to maintain the configuration and scripts yourself. This can be daunting if you have many similar projects. In such cases instead of ejecting we recommend to _fork_ `react-scripts` and any other packages you need. [This article](https://auth0.com/blog/how-to-configure-create-react-app/) dives into how to do it in depth. You can find more discussion in [this issue](https://github.com/facebook/create-react-app/issues/682.md).
+[Ejecting](available-scripts.md#npm-run-eject) lets you customize anything, but from that point on you have to maintain the configuration and scripts yourself. This can be daunting if you have many similar projects. In such cases instead of ejecting we recommend to _fork_ `react-scripts` and any other packages you need. [This article](https://auth0.com/blog/how-to-configure-create-react-app/) dives into how to do it in depth. You can find more discussion in [this issue](https://github.com/facebook/create-react-app/issues/682).

docusaurus/docs/code-splitting.md

@@ -51,6 +51,6 @@ You can also use it with `async` / `await` syntax if you prefer it.
 
 ## With React Router
 
-If you are using React Router check out [this tutorial](http://serverless-stack.com/chapters/code-splitting-in-create-react-app.html) on how to use code splitting with it. You can find the companion GitHub repository [here](https://github.com/AnomalyInnovations/serverless-stack-demo-client/tree/code-splitting-in-create-react-app).
+If you are using React Router check out [this tutorial](https://serverless-stack.com/chapters/code-splitting-in-create-react-app.html) on how to use code splitting with it. You can find the companion GitHub repository [here](https://github.com/AnomalyInnovations/serverless-stack-demo-client/tree/code-splitting-in-create-react-app).
 
 Also check out the [Code Splitting](https://reactjs.org/docs/code-splitting.html) section in React documentation.

docusaurus/docs/deployment.md

@@ -31,7 +31,7 @@ serve -h
 
 You don’t necessarily need a static server in order to run a Create React App project in production. It works just as fine integrated into an existing dynamic one.
 
-Here’s a programmatic example using [Node](https://nodejs.org/) and [Express](http://expressjs.com/):
+Here’s a programmatic example using [Node](https://nodejs.org/) and [Express](https://expressjs.com/):
 
 ```javascript
 const express = require('express');
@@ -79,7 +79,7 @@ If you’re using [Apache HTTP Server](https://httpd.apache.org/), you need to c
 
 It will get copied to the `build` folder when you run `npm run build`.
 
-If you’re using [Apache Tomcat](http://tomcat.apache.org/), you need to follow [this Stack Overflow answer](https://stackoverflow.com/a/41249464/4878474).
+If you’re using [Apache Tomcat](https://tomcat.apache.org/), you need to follow [this Stack Overflow answer](https://stackoverflow.com/a/41249464/4878474).
 
 Now requests to `/todos/42` will be handled correctly both in development and in production.
 
@@ -321,7 +321,7 @@ npm run deploy
 
 Finally, make sure **GitHub Pages** option in your GitHub project settings is set to use the `gh-pages` branch:
 
-<img src="http://i.imgur.com/HUjEr9l.png" width="500" alt="gh-pages branch setting">
+<img src="https://i.imgur.com/HUjEr9l.png" width="500" alt="gh-pages branch setting">
 
 ### Step 5: Optionally, configure the domain
 

docusaurus/docs/developing-components-in-isolation.md

@@ -14,7 +14,7 @@ Usually, it’s hard to see these states without running a sample app or some ex
 
 Create React App doesn’t include any tools for this by default, but you can easily add [Storybook for React](https://storybook.js.org) ([source](https://github.com/storybooks/storybook)) or [React Styleguidist](https://react-styleguidist.js.org/) ([source](https://github.com/styleguidist/react-styleguidist)) to your project. **These are third-party tools that let you develop components and see all their states in isolation from your app**.
 
-![Storybook for React Demo](http://i.imgur.com/7CIAWpB.gif)
+![Storybook for React Demo](https://i.imgur.com/7CIAWpB.gif)
 
 You can also deploy your Storybook or style guide as a static app. This way, everyone in your team can view and review different states of UI components without starting a backend server or creating an account in your app.
 

docusaurus/docs/importing-a-component.md

@@ -37,14 +37,14 @@ class DangerButton extends Component {
 export default DangerButton;
 ```
 
-Be aware of the [difference between default and named exports](http://stackoverflow.com/questions/36795819/react-native-es-6-when-should-i-use-curly-braces-for-import/36796281#36796281). It is a common source of mistakes.
+Be aware of the [difference between default and named exports](https://stackoverflow.com/questions/36795819/react-native-es-6-when-should-i-use-curly-braces-for-import/36796281#36796281). It is a common source of mistakes.
 
 We suggest that you stick to using default imports and exports when a module only exports a single thing (for example, a component). That’s what you get when you use `export default Button` and `import Button from './Button'`.
 
 Named exports are useful for utility modules that export several functions. A module may have at most one default export and as many named exports as you like.
 
 Learn more about ES6 modules:
 
-- [When to use the curly braces?](http://stackoverflow.com/questions/36795819/react-native-es-6-when-should-i-use-curly-braces-for-import/36796281#36796281)
+- [When to use the curly braces?](https://stackoverflow.com/questions/36795819/react-native-es-6-when-should-i-use-curly-braces-for-import/36796281#36796281)
 - [Exploring ES6: Modules](http://exploringjs.com/es6/ch_modules.html)
 - [Understanding ES6: Modules](https://leanpub.com/understandinges6/read#leanpub-auto-encapsulating-code-with-modules)

docusaurus/docs/making-a-progressive-web-app.md

@@ -15,7 +15,7 @@ following in their [`src/index.js`](https://github.com/facebook/create-react-app
 ```js
 // If you want your app to work offline and load faster, you can change
 // unregister() to register() below. Note this comes with some pitfalls.
-// Learn more about service workers: http://bit.ly/CRA-PWA
+// Learn more about service workers: https://bit.ly/CRA-PWA
 serviceWorker.unregister();
 ```
 
@@ -69,7 +69,7 @@ following into account:
 
 1. Service workers [require HTTPS](https://developers.google.com/web/fundamentals/getting-started/primers/service-workers#you_need_https),
    although to facilitate local testing, that policy
-   [does not apply to `localhost`](http://stackoverflow.com/questions/34160509/options-for-testing-service-workers-via-http/34161385#34161385).
+   [does not apply to `localhost`](https://stackoverflow.com/questions/34160509/options-for-testing-service-workers-via-http/34161385#34161385).
    If your production web server does not support HTTPS, then the service worker
    registration will fail, but the rest of your web app will remain functional.
 

docusaurus/docs/proxying-api-requests-in-development.md

@@ -23,7 +23,7 @@ To tell the development server to proxy any unknown requests to your API server
 
 This way, when you `fetch('/api/todos')` in development, the development server will recognize that it’s not a static asset, and will proxy your request to `http://localhost:4000/api/todos` as a fallback. The development server will **only** attempt to send requests without `text/html` in its `Accept` header to the proxy.
 
-Conveniently, this avoids [CORS issues](http://stackoverflow.com/questions/21854516/understanding-ajax-cors-and-security-considerations) and error messages like this in development:
+Conveniently, this avoids [CORS issues](https://stackoverflow.com/questions/21854516/understanding-ajax-cors-and-security-considerations) and error messages like this in development:
 
 ```
 Fetch API cannot load http://localhost:4000/api/todos. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
@@ -35,7 +35,7 @@ The `proxy` option supports HTTP, HTTPS and WebSocket connections.<br>
 If the `proxy` option is **not** flexible enough for you, alternatively you can:
 
 - [Configure the proxy yourself](#configuring-the-proxy-manually)
-- Enable CORS on your server ([here’s how to do it for Express](http://enable-cors.org/server_expressjs.html)).
+- Enable CORS on your server ([here’s how to do it for Express](https://enable-cors.org/server_expressjs.html)).
 - Use [environment variables](adding-custom-environment-variables.md) to inject the right server host and port into your app.
 
 ## "Invalid Host Header" Errors After Configuring Proxy