replace freenode by libera.chat

about/index.xml

@@ -23,8 +23,8 @@ Waterloo, ON  N2L 3G1
 Canada
 </pre>
   <p>Our office phone number is (519) 888-4567 x33870.</p>
-  <p>We also have an IRC channel: <a href="irc://irc.freenode.org/csc">
-    #csc on Freenode</a>.</p>
+  <p>We also have an IRC channel: <a href="irc://irc.libera.chat/csc">
+    #csc on libera.chat</a>.</p>
  </section>
 
  <section title="What... is your quest?">

get-started/index.xml

@@ -23,7 +23,7 @@
 
  <section title="Where Can I Find/Follow CSC?">
     <ul>
-      <li><b>IRC</b>: #csc on freenode. If you are a CSC member, you can use <a href="https://chat.csclub.uwaterloo.ca/">https://chat.csclub.uwaterloo.ca/</a> to connect.</li>
+      <li><b>IRC</b>: #csc on libera.chat. If you are a CSC member, you can use <a href="https://chat.csclub.uwaterloo.ca/">https://chat.csclub.uwaterloo.ca/</a> to connect.</li>
       <li><b>Discord</b>: <a href="https://discord.gg/pHfYBCg">https://discord.gg/pHfYBCg</a></li>
       <li><b>Twitch</b>: <a href="https://twitch.tv/uwcsclub">@uwcsclub</a></li>
       <li><b>Instagram</b>: <a href="https://instagram.com/uwcsclub">@uwcsclub</a></li>