* Updates our channels to point at the same channel name on libera.chat
* Links that used to point to webchat.freenode.net now point to https://libera.chat
* Removes http://irc.freenode.net from the linkcheck exceptions.
* Updates docs/docsite/rst/dev_guide/developing_modules_in_groups.rst
(cherry picked from commit 80e7e1a17c)
Co-authored-by: John R Barker <john@johnrbarker.com>
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Toshio Kuratomi <a.badger@gmail.com>
