[proposal view] Add video recording host hyperlinks.

templates/schedule/item.html

@@ -135,8 +135,16 @@ <h4>Video</h4>
     <iframe src="{{proposal.youtube_url|replace('youtube.com/watch?v=', 'youtube.com/embed/')}}"
         width="100%" height="500px" frameborder="0" 
         allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
-    <p>View this video <a href="{{ proposal.youtube_url }}">on YouTube</a>.</p>
   {% endif %}
+  <p>Direct links to the host(s) of this video recording can be found below:</p>
+  <ul>
+  {% if proposal.c3voc_url %}
+    <li>View this video <a href="{{ proposal.c3voc_url }}">on the Chaos Computer Club's website</a>.</li>
+  {% endif %}
+  {% if proposal.youtube_url %}
+    <li>View this video <a href="{{ proposal.youtube_url }}">on YouTube</a>.</li>
+  {% endif %}
+  </ul>
 </div>
 <p>&nbsp;</p>
 {% endif %}