hotfix: update discord link in alpha notice

Author: sanderson

layouts/partials/article/alpha.html

@@ -46,7 +46,7 @@ <h4>{{ $displayName }} is in Public Alpha</h4>
         </p>
         <div class="expand-content" style="display: none;" >
           <ul class="feedback-channels">
-            <li><a href="https://discord.com/invite/eMnhxPyj" target="_blank" class="discord">InfluxDB Discord Server <em style="opacity:.5">(Preferred)</em></a></li>
+            <li><a href="https://discord.gg/9zaNCW2PRT" target="_blank" class="discord">InfluxDB Discord Server <em style="opacity:.5">(Preferred)</em></a></li>
             <li><a href="https://community.influxdata.com" target="_blank" class="community">InfluxData Community</a></li>
             <li><a href="https://influxdata.com/slack" target="_blank" class="slack">InfluxDB Community Slack</a></li>
             <li><a href="https://reddit.com/r/influxdb" target="_blank" class="reddit">InfluxDB Subreddit</a></li>