Change IRC link from Freenode to Libera

#librecad is no longer registered on Freenode, strange things happens on Freenode these days

Author: lordofbikes

index.html

@@ -53,7 +53,7 @@
         <div class="w3-theme-d4 lc-links lc-text-l4">
             <div class="w3-row lc-row">
                 <div class="w3-cell w3-quarter w3-cell-middle w3-center w3-mobile lc-cell">
-                    <a href="https://webchat.freenode.net/" target="_blank"><i class="fa fa-comments"></i> IRC #librecad</a>
+                    <a href="https://web.libera.chat/" target="_blank"><i class="fa fa-comments"></i> IRC #librecad</a>
                     <br>
                     <a href="https://librecad.zulipchat.com/" target="_blank"><i class="fa fa-comments"></i> Zulip chat</a>
                 </div>