add missing link and alphabetize side-nav

Author: Tony

website/gitlab.erb

@@ -31,24 +31,30 @@
           <li<%= sidebar_current("docs-gitlab-resource-group") %>>
             <a href="/docs/providers/gitlab/r/group.html">gitlab_group</a>
           </li>
+          <li<%= sidebar_current("docs-gitlab-resource-group_membership") %>>
+            <a href="/docs/providers/gitlab/r/group_membership.html">gitlab_group</a>
+          </li>
+          <li<%= sidebar_current("docs-gitlab-resource-group_variable") %>>
+            <a href="/docs/providers/gitlab/r/group_variable.html">gitlab_group</a>
+          </li>
           <li<%= sidebar_current("docs-gitlab-resource-label") %>>
             <a href="/docs/providers/gitlab/r/label.html">gitlab_label</a>
           </li>
-          <li<%= sidebar_current("docs-gitlab-resource-project-hook") %>>
-            <a href="/docs/providers/gitlab/r/project_hook.html">gitlab_project_hook</a>
-          </li>
-          <li<%= sidebar_current("docs-gitlab-resource-project-x") %>>
+          <li<%= sidebar_current("docs-gitlab-resource-project") %>>
             <a href="/docs/providers/gitlab/r/project.html">gitlab_project</a>
           </li>
+          <li<%= sidebar_current("docs-gitlab-resource-project_hook") %>>
+            <a href="/docs/providers/gitlab/r/project_hook.html">gitlab_project_hook</a>
+          </li>
           <li<%= sidebar_current("docs-gitlab-resource-project_membership") %>>
               <a href="/docs/providers/gitlab/r/project_membership.html">gitlab_project_membership</a>
           </li>
+          <li<%= sidebar_current("docs-gitlab-resource-project_variable") %>>
+          <a href="/docs/providers/gitlab/r/project_variable.html">gitlab_project_variable</a>
+          </li>
           <li<%= sidebar_current("docs-gitlab-resource-user") %>>
             <a href="/docs/providers/gitlab/r/user.html">gitlab_user</a>
           </li>
-          <li<%= sidebar_current("docs-gitlab-resource-project-variable") %>>
-            <a href="/docs/providers/gitlab/r/project_variable.html">gitlab_project_variable</a>
-          </li>
         </ul>
         </li>
       </ul>