_content/doc: update IRC server

See golang/go#46281

Change-Id: I35628633e47d92aa449d73512f80ed6326405229
GitHub-Last-Rev: 0013cd4b9719b15b53189f1a056399b028745a9e
GitHub-Pull-Request: golang/website#53
Reviewed-on: https://go-review.googlesource.com/c/website/+/321731
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/_content/doc/gopath_code.html b/_content/doc/gopath_code.html
index 5495e47..87891f1 100644
--- a/_content/doc/gopath_code.html
+++ b/_content/doc/gopath_code.html
@@ -634,7 +634,7 @@
 
 <p>
 For real-time help, ask the helpful gophers in <code>#go-nuts</code> on the
-<a href="https://freenode.net/">Freenode</a> IRC server.
+<a href="https://libera.chat/">Libera.Chat</a> IRC server.
 </p>
 
 <p>
diff --git a/_content/doc/install/source.html b/_content/doc/install/source.html
index e164825..db0e60c 100644
--- a/_content/doc/install/source.html
+++ b/_content/doc/install/source.html
@@ -414,12 +414,9 @@
 <h2 id="community">Community resources</h2>
 
 <p>
-The usual community resources such as
-<code>#go-nuts</code> on the <a href="https://freenode.net/">Freenode</a> IRC server
-and the
-<a href="//groups.google.com/group/golang-nuts">Go Nuts</a>
-mailing list have active developers that can help you with problems
-with your installation or your development work.
+The usual community resources listed on the <a href="/help/">help page</a> have
+active developers that can help you with problems with your installation or your
+development work.
 For those who wish to keep up to date,
 there is another mailing list, <a href="//groups.google.com/group/golang-checkins">golang-checkins</a>,
 that receives a message summarizing each checkin to the Go repository.
diff --git a/_content/help.html b/_content/help.html
index 302f3df..e6da3ba 100644
--- a/_content/help.html
+++ b/_content/help.html
@@ -34,9 +34,9 @@
 <h3 id="slack"><a href="https://blog.gopheracademy.com/gophers-slack-community/">Gopher Slack</a></h3>
 <p>Get live support from other users in the Go slack channel.</p>
 
-<h3 id="irc"><a href="irc:irc.freenode.net/go-nuts">Go IRC Channel</a></h3>
-<p>Get live support at <b>#go-nuts</b> on <b>irc.freenode.net</b>, the official
-Go IRC channel.</p>
+<h3 id="irc"><a href="ircs:irc.libera.chat/go-nuts">Go IRC Channel</a></h3>
+<p>Get live support at <code>#go-nuts</code> on <code>irc.libera.chat</code>,
+the Go IRC channel.</p>
 {{end}}
 
 <h3 id="faq"><a href="/doc/faq">Frequently Asked Questions (FAQ)</a></h3>