fix(template): close extra div in navbar

Added a missing closing `div` tag in the navbar section of the base template to ensure proper HTML structure. This prevents potential rendering issues and maintains consistent layout across all pages using this template.

templates/base.html

@@ -50,6 +50,7 @@
                 <li class="nav-item"><a class="nav-link" href="https://status.private.coffee/">Status</a></li>
             </ul><a class="btn btn-primary shadow navbar-btn" role="button" href="/membership.html">JOIN &amp; SUPPORT</a>
         </div>
+      </div>
     </nav>
     {% if warning %}{{ warning|safe }}{% endif %}
     {% block content %}{% endblock %}