- Make the OAuth config system centralized

- Add support for Github Enterprise login

static/partials/repo-admin.html

@@ -306,7 +306,11 @@
                       <b class="caret"></b>
                     </button>
                     <ul class="dropdown-menu dropdown-menu-right pull-right">
-                      <li><a href="https://github.com/login/oauth/authorize?client_id={{ githubClientId }}&scope=repo,user:email&redirect_uri={{ githubRedirectUri }}/trigger/{{ repo.namespace }}/{{ repo.name }}"><i class="fa fa-github fa-lg"></i>GitHub - Repository Push</a></li>
+                      <li>
+                        <a href="{{ TriggerService.getRedirectUrl('github', repo.namespace, repo.name) }}">
+                          <i class="fa fa-github fa-lg"></i>GitHub - Repository Push
+                        </a>
+                      </li>
                     </ul>
                   </div>
                 </div>