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/build.py

@@ -678,12 +678,7 @@ def build(repo_root: Path) -> None:
     filter_urls: dict[str, str] = dict(category_urls)
     for group in parsed_groups:
         filter_urls[group["name"]] = group_path(group["slug"])
-    for entry in entries:
-        for sub in entry.get("subcategories", []):
-            filter_urls[sub["value"]] = sub["url"]
     builtin_entries = [e for e in entries if e.get("source_type") == BUILTIN_FILTER]
-    if builtin_entries:
-        filter_urls[BUILTIN_FILTER] = BUILTIN_PATH
 
     env = Environment(
         loader=FileSystemLoader(website / "templates"),
@@ -696,7 +691,6 @@ def build(repo_root: Path) -> None:
         shutil.rmtree(site_dir)
     site_dir.mkdir(parents=True)
 
-    filter_urls_json = json.dumps(filter_urls, sort_keys=True, ensure_ascii=False).replace("</", "<\\/")
     homepage_json_ld = json.dumps(
         build_homepage_json_ld(entries, len(categories)),
         ensure_ascii=False,
@@ -715,7 +709,6 @@ def build(repo_root: Path) -> None:
             sponsors=sponsors,
             category_urls=category_urls,
             filter_urls=filter_urls,
-            filter_urls_json=filter_urls_json,
             homepage_json_ld=homepage_json_ld,
         ),
         encoding="utf-8",
@@ -762,7 +755,6 @@ def build(repo_root: Path) -> None:
                 category_urls=category_urls,
                 current_path=current_path,
                 filter_urls=filter_urls,
-                filter_urls_json=filter_urls_json,
                 parent_category=parent_category,
                 group_categories=group_categories,
                 category_json_ld=category_json_ld,