Add discord link

Author: Mark Jessop

index.html

@@ -101,7 +101,7 @@ <h4>Support Us!</h4>
                 <h4>Contact Us!</h4>
                 For SondeHub usage questions and support, feel free to email us at <a href="mailto:support@sondehub.org">support@sondehub.org</a>.
                 <br/><br/>
-                You can also find us on IRC in <a href="https://kiwiirc.com/nextclient/irc.libera.chat/habhub" target="_blank" rel="noopener">#habhub</a> at <b>libera.chat</b>.
+                You can also find us on <a href="https://sondehub.org/go/discord" target="_blank" rel="noopener">Discord</a> and on IRC in <a href="https://kiwiirc.com/nextclient/irc.libera.chat/habhub" target="_blank" rel="noopener">#habhub</a> at <b>libera.chat</b>.
 
                 <h4>Amateur HAB Launches?</h4>
                 You can find Amateur High-Altitude Balloon launches on the <a href="https://amateur.sondehub.org/" target="_blank" rel="noopener">Sondehub-Amateur Tracker</a>.