Yesmap Fedi update.

The Yesmap Matrix server is being retired, and users will soon be given directions as to where they can create a new Matrix account. Instead, the Yesmap.net server will host an Akkoma front end, which means users who re-register will be able to communicate with various activitypub federated servers. This server will have strict rules against erotica and malicious behaviour, will not be disappearing in three weeks due to domain confiscation and is a good opportunity for any BC members who would like to counteract some of the negative tendencies in present day Fediverse - for example, the celebration of antisocial behaviour as a social identity.