add webdav link to jobs serializer

(for easier access)

atdb/taskdatabase/templates/taskdatabase/index.html

@@ -31,7 +31,7 @@
             {% include 'taskdatabase/pagination.html' %}
         </div>
     </div>
-    <p class="footer"> Version 4 July 2023
+    <p class="footer"> Version 6 July 2023
 </div>
 
 {% include 'taskdatabase/refresh.html' %}