simplify cat/tags

categories.html

@@ -1,42 +1,7 @@
 ---
+layout: collection/collection_refpage
 title: Plugins by Category
+collection: repo
+permalink: /categories/
+reference: categories
 ---
-
-{% assign all_cats = "" | split: "/" %}
-{% for plugin in site.repo %}
-  {% for cat in plugin.categories %}
-    {% assign preprocessed = cat | strip | downcase %}
-    {% unless preprocessed == "" %}
-      {% assign all_cats = all_cats | push: preprocessed %}
-    {% endunless %}
-  {% endfor %}
-{% endfor %}
-{% assign all_cats = all_cats | uniq | sort %}
-
-<i class="fa fa-tag"></i>
-{% for cat in all_cats %}
-  {% unless tag == "" %}
-    <a class="label" href="{{ '/categories/' | prepend: site.baseurl }}#{{ cat | slugify }}">
-      <span class="badge rounded-pill bg-warning">{{ cat }}</span>
-    </a>
-  {% endunless %}
-{% endfor %}
-
-{% for cat in all_cats %}
-{% unless cat == "" %}
-<h2 id="{{ cat | slugify }}">{{ cat }}</h2>
-
-<div>
-  {% for plugin in site.repo %}
-    {% assign plugin_cats = "" | split: "/" %}
-    {% for cat in plugin.categories %}
-      {% assign lower_cat = cat | downcase %}
-      {% assign plugin_cats = plugin_cats | push: lower_cat %}
-    {% endfor %}
-    {% if plugin_cats contains cat %}
-      {% include plugin_card.html plugin=plugin %}
-    {% endif %}
-  {% endfor %}
-</div>
-{% endunless %}
-{% endfor %}