Find a way to integrate Matrix Chat

@geek-merlin thanks for this suggestion! It's unlikely we would ever ship with something like this, as (to me) it seems well outside of the 80% use case for sites.

We won't ship with features like this already included but expect users to be able to easily add them via Project Browser. So definitely agree that Drupal integration is a great idea, but unsure of the role of Drupal CMS specifically in this.