Add placeholder pages for Domains and Accounts; mark current page in navbar

templates/base.html.twig

@@ -18,9 +18,15 @@
 
 <nav>
     <ul>
-        <li class="nav_current_page"><a href="/">Dashboard</a></li>
-        <li><a href="/domains">Domains</a></li>
-        <li><a href="/accounts">Accounts</a></li>
+        {% macro navbar_item(path, text) -%}
+        <li{% if current_url() == path or current_url() starts with path ~ '/' %} class="nav_current_page"{% endif %}>
+            <a href="{{ path }}">{{ text }}</a>
+        </li>
+        {%- endmacro -%}
+
+        {{ _self.navbar_item('/', 'Dashboard') }}
+        {{ _self.navbar_item('/domains', 'Domains') }}
+        {{ _self.navbar_item('/accounts', 'Accounts') }}
     </ul>
 </nav>