Remove further traces of IRC channel

(cherry picked from commit 23962c9dc7e0aa59199211b03a6fbb5700c01c30)

README.md

@@ -136,13 +136,12 @@ On [glfw.org](https://www.glfw.org/) you can find the latest version of GLFW, as
 well as news, documentation and other information about the project.
 
 If you have questions related to the use of GLFW, we have a
-[forum](https://discourse.glfw.org/), and the `#glfw` IRC channel on
-[Libera.Chat](https://libera.chat/).
+[forum](https://discourse.glfw.org/).
 
 If you have a bug to report, a patch to submit or a feature you'd like to
 request, please file it in the
 [issue tracker](https://github.com/glfw/glfw/issues) on GitHub.
 
 Finally, if you're interested in helping out with the development of GLFW or
-porting it to your favorite platform, join us on the forum, GitHub or IRC.
+porting it to your favorite platform, join us on the forum or GitHub.
 

docs/CONTRIBUTING.md

@@ -23,13 +23,12 @@ Questions about how to use GLFW should be asked either in the [support
 section](https://discourse.glfw.org/c/support) of the forum, under the [Stack
 Overflow tag](https://stackoverflow.com/questions/tagged/glfw) or [Game
 Development tag](https://gamedev.stackexchange.com/questions/tagged/glfw) on
-Stack Exchange or in the IRC channel `#glfw` on
-[Libera.Chat](https://libera.chat/).
+Stack Exchange.
 
 Questions about the design or implementation of GLFW or about future plans
 should be asked in the [dev section](https://discourse.glfw.org/c/dev) of the
-forum or in the IRC channel.  Please don't open a GitHub issue to discuss design
-questions without first checking with a maintainer.
+forum.  Please don't open a GitHub issue to discuss design questions without
+first checking with a maintainer.
 
 
 ## Reporting a bug

docs/SUPPORT.md

@@ -4,8 +4,7 @@ See the [latest documentation](https://www.glfw.org/docs/latest/) for tutorials,
 guides and the API reference.
 
 If you have questions about using GLFW, we have a
-[forum](https://discourse.glfw.org/), and the `#glfw` IRC channel on
-[Libera.Chat](https://libera.chat/).
+[forum](https://discourse.glfw.org/).
 
 Bugs are reported to our [issue tracker](https://github.com/glfw/glfw/issues).
 Please check the [contribution