Add tutorials to get started with Scala.js, Vite, Laminar and ST.

Author: sjrd

doc/tutorial/getting-started/index.md

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+---
+layout: doc
+title: Getting Started with Scala.js, Vite, Laminar and ScalablyTyped
+---
+
+This series of tutorials teaches you how to use Scala.js together with modern development tools.
+
+If you have time, reading and applying them in order will give you more in-depth knowledge about the development environment.
+
+If you are in a hurry, you can skip the ones you are not interested in.
+Each tutorial starts with a link to repo that you can clone to get off the ground.
+
+In any case, make sure that you have the Prerequisites listed below covered.
+
+## Tutorials
+
+1. [Scala.js and Vite](./scalajs-vite.html): set up a hello world project ready for live reloading in the browser.
+2. [Laminar and ScalablyTyped](./laminar-scalablytyped.html): build UIs with Laminar, and integrate JavaScript libraries with ScalablyTyped.
+
+## Prerequisites
+
+In any case, make sure that you have the following tools installed first:
+
+* [Scala and its development tools](https://www.scala-lang.org/download/)
+* [Node.js](https://nodejs.org/en/download/)
+
+If in doubt, try the following commands in a terminal.
+They should all succeed, though the reported version numbers may differ.
+
+{% highlight shell %}
+$ node -v
+v16.13.0
+$ npm -v
+8.1.0
+$ sbt -version
+sbt version in this project: 1.7.3
+sbt script version: 1.7.3
+{% endhighlight %}
+
+We also recommend that you use an IDE for Scala.
+If you do not know what to pick, we recommend [VS Code](https://code.visualstudio.com/download/) with [the Metals extension](https://scalameta.org/metals/docs/editors/vscode/).