Implement basic group listing and re-enabled group creation

templates/collections/groups_paginated.html

@@ -0,0 +1,21 @@
+{% extends "collections/paginated_base.html" %}
+
+{% block page_title %}Groups{% endblock %}
+
+{% block action_button %}
+  <button
+    type="button"
+    class="btn btn-primary btn-sm"
+    onclick="document.getElementById('new_group_modal').showModal(); return false;"
+  >
+    New Group
+  </button>
+{% endblock action_button %}
+
+{% block action_modals %}
+  {% include "modals/collections/new_group_modal.html" %}
+{% endblock action_modals %}
+
+{% block description %}
+  <p>Users can team up in groups to share packages.</p>
+{% endblock description %}