Move from Freenode to Libera.Chat

The Pleroma project is moving it's chatrooms together with the former freenode staff to Libera.Chat and now considers the chatrooms on Freenode to be unofficial.

This also means a move of the matrix chatrooms to #pleroma:libera.chat and #pleroma-dev:libera.chat.

Our TheLounge instance at https://irc.pleroma.social has already been updated to point to Libera.Chat.

See you on Libera.Chat!

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