Update documentation

index.html

@@ -16,7 +16,7 @@
     <div class="logo-div">
       <div class="latest">
         Latest version: <strong><a
-            href="https://docs.gunicorn.org/en/stable/">20.1.0</a></strong>
+            href="https://docs.gunicorn.org/en/stable/">21.0.0</a></strong>
       </div>
 
       <div class="logo"><img src="images/logo.jpg" ></div>
@@ -118,11 +118,11 @@ <h1>Project Management</h1>
           <li><a href="https://github.com/benoitc/gunicorn/projects/4">Forum</a></li>
           <li><a href="https://github.com/benoitc/gunicorn/projects/3">Mailing list</a>
         </ul>
-        <p>Project maintenance guidelines are avaible on the <a href="https://github.com/benoitc/gunicorn/wiki/Project-management">wiki</a></p>
+        <p>Project maintenance guidelines are available on the <a href="https://github.com/benoitc/gunicorn/wiki/Project-management">wiki</a></p>
 
-        <h1>Irc</h1>
-        <p>The Gunicorn channel is on the <a href="http://freenode.net/">Freenode</a> IRC
-          network. You can chat with the community on the <a href="http://webchat.freenode.net/?channels=gunicorn">#gunicorn channel</a>.</p>
+        <h1>IRC</h1>
+        <p>The Gunicorn channel is on the <a href="https://libera.chat/">Libera Chat</a> IRC
+          network. You can chat with the community on the <a href="https://web.libera.chat/?channels=#gunicorn">#gunicorn channel</a>.</p>
 
         <h1>Issue Tracking</h1>
         <p>Bug reports, enhancement requests and tasks generally go in the <a  href="http://github.com/benoitc/gunicorn/issues">Github