Revert "point dropdown links to vuejobs instead"

This reverts commit d2f0f1f51c868649a053ec3529af0286e9c0fc82.

Author: yyx990803

themes/vue/layout/partials/community_dropdown.ejs

@@ -5,6 +5,6 @@
     <li><a href="http://forum.vuejs.org" class="nav-link" target="_blank">フォーラム</a></li>
     <li><a href="https://gitter.im/vuejs/vue" class="nav-link" target="_blank">チャット</a></li>
     <li><a href="https://twitter.com/vuejs" class="nav-link" target="_blank">Twitter</a></li>
-    <li><a href="https://vuejobs.com/?ref_source=vue" class="nav-link" target="_blank">Jobs</a></li>
+    <li><a href="https://vuejsjob.com/?ref=vuejs" class="nav-link" target="_blank">Jobs</a></li>
   </ul>
 </li>