Update the Docs

[ClemensElflein]

Everything is much simpler now, we need to update the docs.

[tipsy]

You probably want to have an entry here: https://javalin.io/plugins/

[ClemensElflein]

Good idea, so we just fork the https://github.com/javalin/javalin.github.io repo and PR the plugin changes as soon as it's done?

Edit: Looks like it, found the contribution guide.

[tipsy]

Correct!