fix: s/freenode/libera (#233)

* s/freenode/libera

#neovim has moved.

Author: nicdumz

community.html

@@ -28,7 +28,7 @@ <h1>Community</h1>
         <li>Discussion / chat:
           <ul>
             <li><a href="https://gitter.im/neovim/neovim">Gitter</a>
-                and <a href="https://webchat.freenode.net/?channels=neovim"><code>#neovim</code></a>
+                and <a href="https://web.libera.chat/?channels=neovim"><code>#neovim</code></a>
                 (bridged by <a href="https://matrix.org/">matrix</a>)
             </li>
             <li>Web access to Gitter/IRC channels:

index.html

@@ -142,7 +142,7 @@ <h2 id="chat">Chat</h2>
 
       <p>
         Discuss the&nbsp;project at&nbsp;<a href="https://gitter.im/neovim/neovim">gitter.im/neovim</a>
-        or <a href="https://matrix.to/#/#neovim:matrix.org">IRC</a>&nbsp;(#neovim&nbsp;on&nbsp;irc.freenode.net).
+        or <a href="https://matrix.to/#/#neovim:matrix.org">IRC</a>&nbsp;(#neovim&nbsp;on&nbsp;irc.libera.chat).
       </p>
 
       <p>