Indent subgroups on group listing page

tildes/scss/modules/_group.scss

@@ -14,6 +14,12 @@
   .group-subscription-count {
     margin-bottom: 0.2rem;
   }
+
+  @for $indent-level from 1 through 4 {
+    tr.group-level-#{$indent-level} td:first-child {
+      padding-left: #{$indent-level}rem;
+    }
+  }
 }
 
 .group-list-description {

tildes/tildes/templates/groups.jinja2

@@ -22,7 +22,7 @@
     </thead>
     <tbody>
       {% for group in groups %}
-        <tr>
+        <tr class="group-level-{{ group.path|length - 1 }}">
           <td>
             {{ group_linked(group.path) }}
             {% if group.short_description %}