docs: Don't advertise the IRC channel on freenode

We're about to ditch it.

Author: zeenix

CONTRIBUTING.md

@@ -4,9 +4,8 @@ We welcomes contribution from everyone in the form of suggestions, bug reports,
 feedback. This document gives some guidance if you are thinking of helping us.
 
 Please reach out here in a Gitlab (or Github) issue, or in the
-[#zbus:matrix.org](https://matrix.to/#/#zbus:matrix.org) Matrix room (alternatively you can use the
-`#zbus` IRC channel on [`irc.freenode.net`](https://freenode.net), which is bridged to the Matrix
-room) if we can do anything to help you contribute.
+[#zbus:matrix.org](https://matrix.to/#/#zbus:matrix.org) Matrix room if we can do anything to help
+you contribute.
 
 ## Submitting bug reports and feature requests
 

README.md

@@ -319,9 +319,8 @@ $ zbus-xmlgen interface.xml
 
 If you need help in using these crates, are looking for ways to contribute, or just want to hang out
 with the cool kids, please come chat with us in the
-[`#zbus:matrix.org`](https://matrix.to/#/#zbus:matrix.org) Matrix room, (which is also bridged to
-the `#zbus` IRC channel on irc.freenode.net). If something doesn't seem right, please [file an
-issue](https://gitlab.freedesktop.org/dbus/zbus/-/issues/new).
+[`#zbus:matrix.org`](https://matrix.to/#/#zbus:matrix.org) Matrix room. If something doesn't seem
+right, please [file an issue](https://gitlab.freedesktop.org/dbus/zbus/-/issues/new).
 
 # Portability