Update Home -- contact details

Home.md

@@ -27,10 +27,10 @@ Feel free to open tickets on our [Gitlab](https://git.jami.net), help us with th
 
 You can contact us:
 
-- Via https://git.jami.net
-- Via IRC: **\#jami** on [freenode](https://webchat.freenode.net/)
-- By sending a mail on the [mailing
-list](https://lists.gnu.org/mailman/listinfo/jami)
+- via https://git.jami.net
+- via IRC: **\#jami** on [Libera.Chat](https://web.libera.chat)
+- via Matrix: **\#jami:matrix.org**, bridged with the above IRC channel
+- by sending a mail to the Jami mailing list, [jami@gnu.org](https://lists.gnu.org/mailman/listinfo/jami).
 
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