doc, README.md: update IRC server name/URL

README.md

@@ -14,7 +14,7 @@ For basic installation instructions
 
 - [Manual](http://www.musicpd.org/doc/user/)
 - [Forum](http://forum.musicpd.org/)
-- [IRC](irc://chat.freenode.net/#mpd)
+- [IRC](ircs://irc.libera.chat:6697/#mpd)
 - [Bug tracker](https://github.com/MusicPlayerDaemon/MPD/issues/)
 
 # Developers

doc/user.rst

@@ -1120,7 +1120,7 @@ Support
 Getting Help
 ^^^^^^^^^^^^
 
-The :program:`MPD` project runs a `forum <https://forum.musicpd.org/>`_ and an IRC channel (#mpd on Freenode) for requesting help. Visit the MPD help page for details on how to get help.
+The :program:`MPD` project runs a `forum <https://forum.musicpd.org/>`_ and an IRC channel (#mpd on Libera.Chat) for requesting help. Visit the MPD help page for details on how to get help.
 
 Common Problems
 ^^^^^^^^^^^^^^^