Update IRC links

CONTRIBUTING.md

@@ -2,8 +2,8 @@
 
 Contributing just involves sending a pull request. You will probably be more
 successful with your contribution if you visit
-[#sway-devel](https://webchat.freenode.net/?channels=sway-devel) on
-irc.freenode.net upfront and discuss your plans.
+[#sway-devel on Libera.chat](https://libera.chat/guides/connect) upfront and
+discuss your plans.
 
 Note: rules are made to be broken. Adjust or ignore any/all of these as you see
 fit, but be prepared to justify it to your peers.

README.md

@@ -30,7 +30,7 @@ them work independently of one another and freely compose with anything you want
 to implement yourself.
 
 Check out our [wiki] to get started with wlroots. Join our IRC channel:
-[#sway-devel on Freenode].
+[#sway-devel on Libera.chat].
 
 wlroots is developed under the direction of the [sway] project. A variety of
 [wrapper libraries] are available for using it with your favorite programming
@@ -76,7 +76,7 @@ See [CONTRIBUTING.md].
 
 [Wayland]: https://wayland.freedesktop.org/
 [wiki]: https://github.com/swaywm/wlroots/wiki/Getting-started
-[#sway-devel on Freenode]: https://webchat.freenode.net/?channels=sway-devel
+[#sway-devel on Libera.chat]: https://libera.chat/guides/connect
 [Sway]: https://github.com/swaywm/sway
 [wrapper libraries]: https://github.com/search?q=topic%3Abindings+org%3Aswaywm&type=Repositories
 [libseat]: https://git.sr.ht/~kennylevinsen/seatd