fix: make tags link to category pages instead of filtering in place

Clicking a category or group tag filtered the homepage table in place while rewriting the address bar to the category URL, so one URL rendered two different pages and readers never reached category pages with their intros and guides; category pages also showed a redundant self-referential filter bar.

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

website/tests/test_build.py

@@ -280,7 +280,6 @@ class TestBuild:
         parser.feed(category_html)
 
         assert 'href="/categories/widgets/"' in index_html
-        assert 'data-value="Widgets"' in index_html
         assert parser.title.strip() == "Python Widgets Libraries - Awesome Python"
         assert parser.meta_by_name["description"] == "Widget libraries. Also see awesome-widgets. Explore 2 curated Python projects in Widgets."
         assert parser.links_by_rel["canonical"] == "https://awesome-python.com/categories/widgets/"
@@ -816,75 +815,6 @@ class TestBuild:
             {"@type": "ListItem", "position": 2, "name": "Sponsorship", "item": "https://awesome-python.com/sponsorship/"},
         ]
 
-    def test_index_embeds_filter_urls_json(self, tmp_path):
-        readme = textwrap.dedent("""\
-            # T
-
-            ## Projects
-
-            **AI & ML**
-
-            ## Deep Learning
-
-            - [dl1](https://example.com/dl1) - DL.
-
-            ## Machine Learning
-
-            - Classical
-
-                - [ml1](https://example.com/ml1) - ML.
-
-            # Contributing
-
-            Done.
-        """)
-        self._copy_real_templates(tmp_path)
-        (tmp_path / "README.md").write_text(readme, encoding="utf-8")
-        build(tmp_path)
-
-        site = tmp_path / "website" / "output"
-        index_html = (site / "index.html").read_text(encoding="utf-8")
-
-        marker = '<script type="application/json" id="filter-urls">'
-        assert marker in index_html
-        start = index_html.index(marker) + len(marker)
-        end = index_html.index("</script>", start)
-        data = json.loads(index_html[start:end])
-
-        assert data["Deep Learning"] == "/categories/deep-learning/"
-        assert data["Machine Learning"] == "/categories/machine-learning/"
-        assert data["AI & ML"] == "/categories/ai-ml/"
-        assert data["Machine Learning > Classical"] == "/categories/machine-learning/classical/"
-
-    def test_filter_urls_json_escapes_closing_script_tag(self, tmp_path):
-        readme = textwrap.dedent("""\
-            # T
-
-            ## Projects
-
-            ## Sneaky </script><script>x=1</script>
-
-            - [a](https://example.com) - A.
-
-            # Contributing
-
-            Done.
-        """)
-        self._copy_real_templates(tmp_path)
-        (tmp_path / "README.md").write_text(readme, encoding="utf-8")
-        build(tmp_path)
-
-        site = tmp_path / "website" / "output"
-        index_html = (site / "index.html").read_text(encoding="utf-8")
-
-        marker = '<script type="application/json" id="filter-urls">'
-        start = index_html.index(marker) + len(marker)
-        end = index_html.index("</script>", start)
-        block = index_html[start:end]
-        assert "</script>" not in block
-        data = json.loads(block)
-        assert any("Sneaky" in key for key in data)
-
     def test_build_creates_group_pages(self, tmp_path):
         readme = textwrap.dedent("""\
             # T
@@ -925,7 +855,7 @@ class TestBuild:
         assert "wf1" in web_dev
         assert "dl1" not in web_dev
 
-    def test_tag_buttons_have_data_url(self, tmp_path):
+    def test_tags_link_to_pages_and_subcategory_anchors(self, tmp_path):
         readme = textwrap.dedent("""\
             # T
 
@@ -950,11 +880,14 @@ class TestBuild:
         site = tmp_path / "website" / "output"
         index_html = (site / "index.html").read_text(encoding="utf-8")
 
-        assert 'data-value="Deep Learning"' in index_html
-        assert 'data-url="/categories/deep-learning/"' in index_html
-        assert 'data-value="AI &amp; ML"' in index_html or 'data-value="AI & ML"' in index_html
-        assert 'data-url="/categories/ai-ml/"' in index_html
-        assert 'data-url="/categories/deep-learning/vision/"' in index_html
+        category_html = (site / "categories" / "deep-learning" / "index.html").read_text(encoding="utf-8")
+
+        for html in (index_html, category_html):
+            assert 'href="/categories/deep-learning/#vision"' in html
+            assert 'href="/categories/ai-ml/"' in html
+            assert "data-url=" not in html
+        assert 'href="/categories/deep-learning/"' in index_html
+        assert 'id="vision"' in category_html
 
     _REDIRECT_README = textwrap.dedent("""\
         # Awesome Python