refactor: update verbiage for single video

The header should indicate that only one video is below. This avoids confusion for the user wondering if more videos are loading.

Author: Jer-Pha

pythonsd/templates/pythonsd/index.html

@@ -78,7 +78,7 @@ <h5 class="mt-0 mb-1"><a href="https://jfrog.com/" rel="nofollow noopener norefe
         </div> <!-- /col -->
 
         <div class="col-lg-6">
-          <h3>Recent videos &amp; streams</h3>
+          <h3>Latest video</h3>
 
           <div id="youtube-widget" hx-get="{% url 'recent_videos' %}" hx-trigger="load">
             <p class="small py-5">Loading...</p>