Remove unused files and dependencies

- Delete empty modules (comic/views.py, comic/urls.py, comic/forms.py), the
  empty mypy.ini, .readthedocs.yaml (no docs/ directory, pins Python 3.8) and
  setup.py (distutils is gone in Python 3.12+ and it still listed the deleted
  comic_auth; packaging is handled by pyproject.toml).
- Untrack the base64 PDF blob 'data' and the manual-only test_comics fixtures;
  the suite builds archives in tmp_path via comic/tests/factories.py. UnRAR.exe
  stays on disk for manual rarfile testing but is not in git.
- Drop unused dependencies: django-bootstrap4, django-sri, drf-extensions,
  mysqlclient, setuptools.
- build-test.ps1 no longer uses poetry.
- Ignore .venv/, .mypy_cache/, .ruff_cache/.

build-test.ps1

@@ -1,4 +1,3 @@
-poetry export --without-hashes -f requirements.txt --output requirements.txt
-$version=poetry version -s
+$version=uv version --short
 docker build . -t ajurna/cbwebreader:beta --no-cache
-# docker push ajurna/cbwebreader:beta
+# docker push ajurna/cbwebreader:beta