Meta: link to new Chat page (whatwg#6747)

CONTRIBUTING.md

@@ -6,7 +6,7 @@ The HTML Standard is quite complex and people notice minor and larger issues wit
 
 We label [good first issues](https://github.com/whatwg/html/labels/good%20first%20issue) that you could help us fix, to get a taste for how to submit pull requests, how the build process works, and so on.
 
-We'd be happy to mentor you through this process. If you're interested and need help getting started, leave a comment on the issue or bug, or ask around [on IRC](https://whatwg.org/irc). The [FAQ](FAQ.md) may also be helpful.
+We'd be happy to mentor you through this process. If you're interested and need help getting started, leave a comment on the issue or bug, or [ask around](https://whatwg.org/chat). The [FAQ](FAQ.md) may also be helpful.
 
 ## Pull requests
 

FAQ.md

@@ -82,11 +82,11 @@ Since then, we've realized that much like the [waterfall model](https://en.wikip
 
 ### Is design rationale documented?
 
-Sort of. Often some record of the rationale for a particular design choice can be found within discussions in the GitHub issue tracker, commit logs, or the mailing-list archive or IRC channel archives. Sometimes, there is an explanation in the specification, but doing that everywhere would make the specification huge.
+Sort of. Often some record of the rationale for a particular design choice can be found within discussions in the GitHub issue tracker, commit logs, or the mailing-list archive or [Chat archives](https://whatwg.org/chat#logs). Sometimes, there is an explanation in the specification, but doing that everywhere would make the specification huge.
 
 For a few cases that someone did take the time document, the information can be found at the following locations:
 
-* [Rationale](https://wiki.whatwg.org/wiki/Rationale) — a page that documents some reasons behind decisions in the spec, originally written and maintained by Variable. If anyone wants to help him out, try to grab someone on [IRC](https://wiki.whatwg.org/wiki/IRC); we're always looking for more contributors and this is a good place to start.
+* [Rationale](https://wiki.whatwg.org/wiki/Rationale) — a page that documents some reasons behind decisions in the spec, originally written and maintained by Variable. If anyone wants to help him out, try to find someone via [Chat](https://whatwg.org/chat); we're always looking for more contributors and this is a good place to start.
 * [Why no namespaces](https://wiki.whatwg.org/wiki/Why_no_namespaces)
 * [Why no script implements](https://wiki.whatwg.org/wiki/Why_no_script_implements)
 * [Why not reuse legend](https://wiki.whatwg.org/wiki/Why_not_reuse_legend) or another _mini-header_ element.

source

@@ -74,7 +74,7 @@
     </div>
     <div>
      <a class="misc" href="https://github.com/whatwg/html/blob/main/FAQ.md"><span data-x=""><strong>FAQ</strong> <code data-x="">on GitHub</code></span></a>
-     <a class="comms" href="https://wiki.whatwg.org/wiki/IRC"><span data-x=""><strong>Join us on IRC</strong> <code data-x="">#whatwg on Freenode</code></span></a>
+     <a class="comms" href="https://whatwg.org/chat"><span data-x=""><strong>Chat</strong> <code data-x="">on Matrix</code></span></a>
     </div>
     <div>
      <a class="changes" href="https://github.com/whatwg/html"><span data-x=""><strong>Contribute on GitHub</strong> <code data-x="">whatwg/html repository</code></span></a>