Rename "Get involved" and add IRC to external resources.

--
MOS_MIGRATED_REVID=125666650
diff --git a/site/_layouts/contribute.html b/site/_layouts/contribute.html
index b0b29e0..1e89798 100644
--- a/site/_layouts/contribute.html
+++ b/site/_layouts/contribute.html
@@ -30,11 +30,12 @@
               <li><a href="/roadmap.html">Roadmap</a></li>
               <li><a href="/governance.html">Governance</a></li>
             </ul>
-            <h3>Get Involved</h3>
+            <h3>External Resources</h3>
             <ul class="sidebar-nav">
               <li><a href="https://github.com/bazelbuild/bazel">GitHub</a></li>
               <li><a href="https://groups.google.com/forum/#!forum/bazel-dev">Developer mailing list</a></li>
               <li><a href="https://bazel-review.googlesource.com">Gerrit</a></li>
+              <li><a href="irc://irc.freenode.net/bazel">IRC</a><li>
             </ul>
           </nav>
         </div>