discourse/app/assets/javascripts/admin/templates/admin.hbs

<div class="container">
  <div class="row">
    <div class="full-width">

      <ul class="nav nav-pills">
        {{nav-item route='admin.dashboard' label='admin.dashboard.title'}}
        {{#if currentUser.admin}}
          {{nav-item route='adminSiteSettings' label='admin.site_settings.title'}}
        {{/if}}
        {{nav-item route='adminUsersList' label='admin.users.title'}}
        {{#if showBadges}}
          {{nav-item route='adminBadges' label='admin.badges.title'}}
        {{/if}}
        {{#if currentUser.admin}}
          {{nav-item route='adminGroups' label='admin.groups.title'}}
          {{nav-item route='adminEmail' label='admin.email.title'}}
        {{/if}}
        {{nav-item route='adminFlags' label='admin.flags.title'}}
        {{nav-item route='adminLogs' label='admin.logs.title'}}
        {{#if currentUser.admin}}
          {{nav-item route='adminCustomize' label='admin.customize.title'}}
          {{nav-item route='admin.api' label='admin.api.title'}}
          {{nav-item route='admin.backups' label='admin.backups.title'}}
        {{/if}}
        {{nav-item route='adminPlugins' label='admin.plugins.title'}}
        {{plugin-outlet "admin-menu" tagName="li"}}
      </ul>

      <div class='boxed white admin-content'>
        <div class='admin-contents'>
          {{outlet}}
        </div>
      </div>

    </div>
  </div>
</div>