feat: link section use-case headings to their subcategory pages

With tags now pointing at section anchors instead of filtering in place, subcategory pages (74 clicks and 19.7K impressions in the last 3 months) had no other internal links pointing to them.

Co-Authored-By: Claude <noreply@anthropic.com>

website/build.py

@@ -276,7 +276,8 @@ def group_section_entries(section: ParsedSection, entries_by_key: dict[tuple[str
     groups: dict[str, EntryGroup] = {}
     for parsed in section["entries"]:
         name = parsed["subcategory"]
-        group = groups.setdefault(name, EntryGroup(name=name, slug=slugify(name) if name else "", url="", entries=[]))
+        slug = slugify(name) if name else ""
+        group = groups.setdefault(name, EntryGroup(name=name, slug=slug, url=subcategory_path(section["slug"], slug) if name else "", entries=[]))
         group["entries"].append(entries_by_key[(parsed["url"], parsed["name"])])
     return list(groups.values())
 

website/tests/test_build.py

@@ -990,6 +990,7 @@ class TestBuild:
         positions = [html.index(marker) for marker in ('<h2 id="small">', ">w2</a", ">w1</a", '<h2 id="large">', ">w3</a")]
         assert positions == sorted(positions)
         assert '<a class="jump-link" href="#small">Small</a>' in html
+        assert '<a href="/categories/widgets/small/">Small</a>' in html
         assert '<tr class="desc-row">' in html
 
         subcategory_html = (site / "widgets" / "small" / "index.html").read_text(encoding="utf-8")