Add mailing list signup, revise about sidebar

Author: bernhold

_config.yml

@@ -101,6 +101,9 @@ defaults:
 
 footer:
   links:
+    - label: "Announcement list signup"
+      icon: "fas fa-envelope"
+      url: http://eepurl.com/iRiSnY
     - label: "Email Us"
       icon: "fas fa-envelope"
       url:  "mailto:cass-steering-committee@email.ornl.gov"

_includes/about-sidebar.html

@@ -3,21 +3,27 @@ <h3>Join us!</h3>
 
   <p>There are many ways to get involved.</p>
 
+  <h4>Follow us</h4>
+
+  <p>Get updates on CASS events and news.</p>
+
+  <p><i class="fa-solid fa-caret-right"></i> Join our <a href="http://eepurl.com/iRiSnY">announcement list</a>.</p>
+
   <h4>Join working groups</h4>
 
   <p>CASS has working groups on many different topics.</p>
 
-  <p>Contact the chair of <a href="{{ "/working-groups/" | relative_url }}">working groups</a> of interest. Or suggest a new working group to the <a href="mailto:cass-steering-committee@email.ornl.gov">CASS Steering Committee</a>.</p>
+  <p><i class="fa-solid fa-caret-right"></i> Contact the <a href="{{ "/working-groups/" | relative_url }}">working group</a> chair. Or <a href="mailto:cass-steering-committee@email.ornl.gov?subject=Working group suggestion">suggest a new working group</a>.</p>
 
   <h4>Connect with CASS members</h4>
 
   <p>If you're interested in specific areas of the software ecosystem, there may be a CASS member organization actively engaged with that community.</p>
 
-  <p>Reach out to the leadership of the <a href="#current-members-and-leadership">member organization</a>.</p>
+  <p><i class="fa-solid fa-caret-right"></i> Reach out to the <a href="#current-members-and-leadership">member organization</a>.</p>
 
   <h4>Become a member of CASS</h4>
 
-  <p>We welcome projects and organizations with similar scientific software stewardship missions to consider joining CASS as a member. DOE sponsorship is <em>not</em> required.
+  <p>We welcome projects and organizations with similar scientific software stewardship missions to consider membership in CASS. DOE sponsorship is <em>not</em> required.
 
-  <p>Contact the <a href="mailto:cass-steering-committee@email.ornl.gov">CASS Steering Committee</a>.</p>
+  <p><i class="fa-solid fa-caret-right"></i> Contact the <a href="mailto:cass-steering-committee@email.ornl.gov?subject=Membership interest">CASS Steering Committee</a>.</p>
 </div>