better picture of SMSU and update submission date

conservancy/fossy/templates/fossy/community_track_proposal_form.html

@@ -9,7 +9,7 @@
 
     <p>Please fill out the questions below to apply. We want the conference to appeal to a wide audience, so are looking for tracks ranging from specific technical topics and people-focused themes, to the collaborative future of free software. We'd like to see a diversity of both niche and general topics that allow people from different backgrounds to participate.</p>
 
-    <p><strong>The deadline for submission is Monday April 8th 2024.</strong></p>
+    <p><strong>The deadline for submission is Monday April 18th 2024.</strong></p>
 
     <form action="." method="post" class="mw7">
       {% csrf_token %}