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/.

pyproject.toml

@@ -11,7 +11,6 @@ dependencies = [
     "dj-database-url>=3.1.2",
     "django>=6.1.2",
     "django-boost>=2.2",
-    "django-bootstrap4>=26.3",
     "django-cors-headers>=4.9.0",
     "django-csp>=4.0",
     "django-extensions>=4.1",
@@ -19,21 +18,17 @@ dependencies = [
     "django-imagekit>=6.1.1",
     "django-permissions-policy>=4.34.0",
     "django-silk>=5.6.0",
-    "django-sri>=1.0.0",
     "django-webpack-loader>=3.2.4",
     "djangorestframework>=3.18.3",
     "djangorestframework-simplejwt>=5.5.1",
-    "drf-extensions>=0.7.1",
     "drf-yasg>=1.21.18",
     "gunicorn>=26.2.0",
     "loguru>=0.7.3",
-    "mysqlclient>=2.3.0",
     "pillow>=12.3.0",
     "psycopg2-binary>=2.9.13",
     "pymupdf>=1.28.2",
     "python-dotenv>=1.2.4",
     "rarfile>=4.5",
-    "setuptools>=84.0.0",
 ]
 
 [dependency-groups]