Switch IRC channel to #wlroots

The #sway-devel channel is now for Sway development only. #wlroots
is the new channel to use for wlroots.

We were using #sway-devel mostly for histerical raisins. Nowadays
many wlroots developers are not working on Sway.

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3586

CONTRIBUTING.md

@@ -1,7 +1,7 @@
 # Contributing to wlroots
 
 Contributing just involves sending a merge request. You will probably be more
-successful with your contribution if you visit [#sway-devel on Libera Chat]
+successful with your contribution if you visit [#wlroots on Libera Chat]
 upfront and discuss your plans.
 
 Note: rules are made to be broken. Adjust or ignore any/all of these as you see
@@ -421,7 +421,7 @@ static void subsurface_handle_surface_destroy(struct wl_listener *listener,
 }
 ```
 
-[#sway-devel on Libera Chat]: https://web.libera.chat/gamja/?channels=#sway-devel
+[#wlroots on Libera Chat]: https://web.libera.chat/gamja/?channels=#wlroots
 [linear, "recipe" style]: https://www.bitsnbites.eu/git-history-work-log-vs-recipe/
 [git-rebase.io]: https://git-rebase.io/
 [reference issues]: https://docs.gitlab.com/ee/user/project/issues/managing_issues.html#closing-issues-automatically

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 Libera Chat].
+[#wlroots on Libera Chat].
 
 A variety of [wrapper libraries] are available for using it with your favorite
 programming language.
@@ -76,7 +76,7 @@ See [CONTRIBUTING.md].
 
 [Wayland]: https://wayland.freedesktop.org/
 [wiki]: https://gitlab.freedesktop.org/wlroots/wlroots/-/wikis/Getting-started
-[#sway-devel on Libera Chat]: https://web.libera.chat/gamja/?channels=#sway-devel
+[#wlroots on Libera Chat]: https://web.libera.chat/gamja/?channels=#wlroots
 [wrapper libraries]: https://gitlab.freedesktop.org/wlroots/wlroots/-/wikis/Projects-which-use-wlroots#wrapper-libraries
 [libseat]: https://git.sr.ht/~kennylevinsen/seatd
 [hwdata]: https://github.com/vcrhonek/hwdata