move chat to libera.chat

chat.html

@@ -6,4 +6,4 @@
 layout: page
 ---
 <p>You do not need to register to participate. This chat is public. <strong>We never ask you to submit credit-card (any other payment information) nor personal information.</strong> It is provided by kiwi via freenode. Read the privacy policy of <a target="_blank" rel="noopener" href="https://kiwiirc.com/privacy">Kiwi</a> and <a target="_blank" rel="noopener" href="https://freenode.net/policies">Freenode</a><br />Matrix user? <a href="{{ site.social.irc.matrix }}" target="_blank" rel="noopener">Click here</a></p>
-<iframe src="https://kiwiirc.com/client/irc.freenode.net/?nick={{ site.social.irc.guest-nick }}|?&theme=cli{{ site.social.irc.channel }}" style="border:0; width:100%; height:540px;"></iframe>
+<iframe src="https://kiwiirc.com/client/irc.libera.chat/?nick={{ site.social.irc.guest-nick }}|?&theme=cli{{ site.social.irc.channel }}" style="border:0; width:100%; height:540px;"></iframe>