feat: add site back to website (temp) (#3267)

* feat: add site back to website

* refactor: use same sidebar

* fix: delete generated docs

website/tutorial/nodejs/EventHandler/getting-started.md

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+---
+sidebar_position: 1
+---
+
+# Getting Started with the Event Handler
+
+An event handler is essential to process the data, which Discord sends to you.
+
+With a good implementation, you will have a nice code structure and thus have a good overview in long term.
+
+Since the `EventEmitter` class is commonly used you probably already know it from other libraries.
+
+Discordeno decided against it as it comes with several downsides which are mentioned below.
+
+- It's easy to create memory leaks, when you add too many listeners or go carelessly with it.
+- Many fragmented parts of event code complicate maintenance.
+- ErrorHandling is difficult and debugging is harder when many listeners are open for the same events.
+
+Performance plays a more important role than handling, however this event management system can be easily implemented
+since it only needs a few changes in your code.
+
+In the following we will show you, how to create an event manager, which is compatible with Discordeno's Client.
+
+:::info template
+
+You can also copy the
+[`EventManager` from the template repo](https://github.com/discordeno/discordeno/tree/main/template/nodejs/Managers/EventManager.js).
+
+:::