index.html: Switch to Libera.

Signed-off-by: Willy Sudiarto Raharjo <willysr@gmail.com>

index.html

@@ -93,7 +93,7 @@ <h2>MATE SlackBuilds</h2>
            bug reports at the Github repo or send us an email at
            mateslackbuilds@gmail.com</li>
 	   <li>Q: Are there any IRC support for MSB Project?</li>
-	   <li>A: Yes, we have created #msb channel on freenode network.</li>
+	   <li>A: Yes, we have created #msb channel on <a href="https://libera.chat/">Libera network</a>.</li>
 	   <li>Q: Does this site have a backup?</li>
 	   <li>A: This site's source code is hosted at GitHub and we also have secondary domain
 	   at <a href="https://mateslackbuilds.netlify.app">https://mateslackbuilds.netlify.app/</a>.