refactor(build): remove unused group_categories wrapper

group_categories only ever appended a Resources group when the
resources list was non-empty. All call sites passed an empty list,
making it a no-op indirection. Inline parsed_groups directly and
remove the dead code along with its tests.

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

website/tests/test_build.py

@@ -8,7 +8,6 @@ from pathlib import Path
 from build import (
     build,
     extract_github_repo,
-    group_categories,
     load_stars,
     sort_entries,
 )
@@ -42,40 +41,6 @@ class TestSlugify:
         assert slugify("  Date  and  Time  ") == "date-and-time"
 
 
-# ---------------------------------------------------------------------------
-# group_categories
-# ---------------------------------------------------------------------------
-
-
-class TestGroupCategories:
-    def test_appends_resources(self):
-        parsed_groups = [
-            {"name": "G1", "slug": "g1", "categories": [{"name": "Cat1"}]},
-        ]
-        resources = [{"name": "Newsletters", "slug": "newsletters"}]
-        groups = group_categories(parsed_groups, resources)
-        group_names = [g["name"] for g in groups]
-        assert "G1" in group_names
-        assert "Resources" in group_names
-
-    def test_no_resources_no_extra_group(self):
-        parsed_groups = [
-            {"name": "G1", "slug": "g1", "categories": [{"name": "Cat1"}]},
-        ]
-        groups = group_categories(parsed_groups, [])
-        assert len(groups) == 1
-        assert groups[0]["name"] == "G1"
-
-    def test_preserves_group_order(self):
-        parsed_groups = [
-            {"name": "Second", "slug": "second", "categories": [{"name": "C2"}]},
-            {"name": "First", "slug": "first", "categories": [{"name": "C1"}]},
-        ]
-        groups = group_categories(parsed_groups, [])
-        assert groups[0]["name"] == "Second"
-        assert groups[1]["name"] == "First"
-
-
 # ---------------------------------------------------------------------------
 # build (integration)
 # ---------------------------------------------------------------------------