Add templates to proceedings summary

proceedings/templates/partials/proceedings/summary.html

@@ -39,4 +39,8 @@
     <th>Submission Close</th>
     <td>{{ proceedings.submissions_close }}</td>
   </tr>
+  <tr>
+    <th>Templates</th>
+    <td><a href="{{ proceedings.template_latex_tgz.url }}">LaTeX (gzipped tarball)</a></td>
+  </tr>
 </table>