Add more to the homeserver section

- config quirks such as [presence being disabled](https://equestria.social/@Karcsesz/114853532244012607)
- eventually the room directory policy
- additional components
- bridges and how to use them -> see status.matrix.org for what's there?
- https://github.com/matrix-org/matrix-bifrost/wiki/Address-syntax
- MAS account.matrix.org
- sydent identity server
- beta.matrix.org?

Start by locating the homeserver section in the matrix.org website and reviewing its existing structure. Research the listed configuration quirks, room directory policy, bridges, MAS, Sydent, and beta.matrix.org using the linked references. Done means the relevant items are accurately documented with appropriate links and clear scope.

Written by the indexing model from the issue text.