Fix poetry subcat links in /content page

Gemfile.lock

@@ -90,7 +90,7 @@ GEM
     rexml (3.2.5)
     rouge (4.1.2)
     safe_yaml (1.0.5)
-    sass-embedded (1.63.5)
+    sass-embedded (1.63.6)
       google-protobuf (~> 3.23)
       rake (>= 13.0.0)
     terminal-table (3.0.2)
@@ -115,4 +115,4 @@ DEPENDENCIES
   webrick (~> 1.7)
 
 BUNDLED WITH
-   2.4.10
+   2.4.6

_categories/essays.md

@@ -6,8 +6,6 @@ similars:
   - papers
   - excerpts
   - booklets
-subcats:
-  - poetry
 ---
 
 Essays are short pieces of writing that were published independently, for example on a blog.

_includes/content-category-row.html

@@ -1,8 +1,11 @@
 <tr>
 {% assign catcon = site.content | where: "category", include.category %}
+{% assign poetrycon = catcon | where: "subcat", "poetry" %}
 {% assign category =  site.categories | find: "slug", include.category %}
 <td>{% include_cached content_icon.html category=include.category %} <a href="{{ category.url }}">{{ category.title }}</a>
-{% if category.subcats %}<ul>{% for subcat in category.subcats %}
+{% if category.subcats or poetrycon.size > 0 %}<ul>{% if poetrycon.size > 0 %}
+<li style="list-style:none;">{% include_cached content_icon.html subcat="poetry" %} <a href="/search/?q=%2Bis%3Apoetry&filter=%2Bin%3A{{ include.category }}">poetry</a> ({{ poetrycon | size }})</li>
+{% endif %}{% for subcat in category.subcats %}
 <li style="list-style:none;">{% include_cached content_icon.html category=include.category subcat=subcat %} <a href="/search/?q=%2Bis%3A{{ subcat }}">{{ subcat }}</a> ({{ catcon | where: "subcat", subcat | size }})</li>
 {% endfor %}</ul>{% endif %}
 </td>