feat: migrate README parser to markdown-it-py and refresh website

Switch readme_parser.py from regex-based parsing to markdown-it-py for
more robust and maintainable Markdown AST traversal. Update build pipeline,
templates, styles, and JS to support the new parser output. Refresh GitHub
stars data and update tests to match new parser behavior.

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

website/tests/test_build.py

@@ -1,13 +1,10 @@
 """Tests for the build module."""
 
 import json
-import os
 import shutil
-import sys
 import textwrap
 from pathlib import Path
 
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
 from build import (
     build,
     extract_github_repo,
@@ -149,27 +146,6 @@ class TestBuild:
         # No category sub-pages
         assert not (site / "categories").exists()
 
-    def test_build_creates_cname(self, tmp_path):
-        readme = textwrap.dedent("""\
-            # T
-
-            ---
-
-            ## Only
-
-            - [x](https://x.com) - X.
-
-            # Contributing
-
-            Done.
-        """)
-        self._make_repo(tmp_path, readme)
-        build(str(tmp_path))
-
-        cname = tmp_path / "website" / "output" / "CNAME"
-        assert cname.exists()
-        assert "awesome-python.com" in cname.read_text()
-
     def test_build_cleans_stale_output(self, tmp_path):
         readme = textwrap.dedent("""\
             # T