The libera.chat matrix bridge shut down a while ago, so links to our
room on matrix load forever. Additionally, we use matrix rather than the
IRC room so we should not be advertising it when they will only need to
be redirected to the right place if they join.

I run a matrix homeserver (clicks.codes) and have set up a room address
on there. By telling people this room address instead of the libera.chat
one they can join the existing room even though libera.chat is not
hosting matrix.

Signed-off-by: Skyler Grey <skyler.grey@collabora.com>
Change-Id: I8a4224f1a856e7295325196f1b1a80f860ed7962