feat: Rewrite nav, improve comment faves/boosts

Also, this is perhaps last featire commit here, I'll merge duckquill and my main site, it can be still used as a theme, it's just will be more convenient

templates/includes/nav.html

@@ -1,5 +1,5 @@
-<nav class="nav">
-  <div class="nav-container">
+<header>
+  <nav>
     <a href="{{ get_url(path='') }}">
       {% if config.extra.nav.icons %}
         <i class="bi bi-house"></i>
@@ -29,5 +29,5 @@
       </li>
       {% endif %}
     </ul>
-  </div>
-</nav>
+  </nav>
+</header>