Move installing a dependency to its own file

Author: selbekk

docusaurus/docs/installing-a-dependency.md

@@ -0,0 +1,18 @@
+---
+id: installing-a-dependency
+title: Installing a Dependency
+---
+
+The generated project includes React and ReactDOM as dependencies. It also includes a set of scripts used by Create React App as a development dependency. You may install other dependencies (for example, React Router) with `npm`:
+
+```sh
+npm install --save react-router-dom
+```
+
+Alternatively you may use `yarn`:
+
+```sh
+yarn add react-router-dom
+```
+
+This works for any library, not just `react-router-dom`.

docusaurus/docs/user-guide.md

@@ -11,7 +11,6 @@ You can find the most recent version of this guide [here](https://github.com/fac
 
 ## Table of Contents
 
-- [Installing a Dependency](#installing-a-dependency)
 - [Importing a Component](#importing-a-component)
 - [Code Splitting](#code-splitting)
 - [Adding a Stylesheet](#adding-a-stylesheet)
@@ -50,22 +49,6 @@ You can find the most recent version of this guide [here](https://github.com/fac
 - [Advanced Configuration](#advanced-configuration)
 - [Alternatives to Ejecting](#alternatives-to-ejecting)
 
-## Installing a Dependency
-
-The generated project includes React and ReactDOM as dependencies. It also includes a set of scripts used by Create React App as a development dependency. You may install other dependencies (for example, React Router) with `npm`:
-
-```sh
-npm install --save react-router-dom
-```
-
-Alternatively you may use `yarn`:
-
-```sh
-yarn add react-router-dom
-```
-
-This works for any library, not just `react-router-dom`.
-
 ## Importing a Component
 
 This project setup supports ES6 modules thanks to Webpack.<br>

docusaurus/website/sidebars.json

@@ -16,7 +16,10 @@
       "developing-components-in-isolation",
       "analyzing-the-bundle-size"
     ],
-    "How-to": ["changing-the-page-title"],
+    "How-to": [
+      "changing-the-page-title",
+      "installing-a-dependency"
+    ],
     "Testing": ["running-tests", "debugging-tests"],
     "Deployment": ["publishing-components-to-npm", "deployment"],
     "Support": [