Add section about joining users list

landing-pages/site/content/en/community/_index.html

@@ -80,6 +80,24 @@ <h6 class="community--header-persona">Are you a user?</h6>
                 </p>
             </ol>
             {{< /accordion >}}
+            {{< accordion title="Join the Users mailing list" description="The Users list is the preferred channel for important announcements: release and security and asking for help from other users." logo_path="icons/join-devlist-icon.svg">}}
+            <p class="bodytext__medium--brownish-grey">
+                Manage your <b>subscription</b>:
+            </p>
+            <ul class="ticks-blue mx-auto">
+                <li class="text-break-all"><a class="list-link" href="mailto:[email protected]">[email protected]</a></li>
+                <li class="text-break-all"><a class="list-link" href="mailto:[email protected]">[email protected]</a></li>
+            </ul>
+            <p class="bodytext__medium--brownish-grey">
+                Browse the <b>archive</b>:
+            </p>
+            <ul class="ticks-blue mx-auto">
+                <li class="text-break-all"><a class="list-link" href="https://lists.apache.org/[email protected]">https://lists.apache.org/[email protected]</a></li>
+            </ul>
+            <p class="bodytext__medium--brownish-grey">
+                For answers to ad hoc questions, try asking in the official <b>Airflow Slack</b> first. See <b>"Ask a question"</b> below for details and additional resources.
+            </p>
+            {{< /accordion >}}
             {{< accordion title="Ask a question" description="Reach out to other users and contributors. There are at least three ways to do this." logo_path="icons/ask-question-icon.svg">}}
             <ol class="counter-blue mx-auto">
                 <li>Ask in the <a href="https://apache-airflow-slack.herokuapp.com/">Apache Airflow Slack</a></li>