Refactor test utilities and enhance ASGI settings

- Cleaned up and standardized assertions in ApiTestMixin for API response validation.
- Updated ASGI settings to use os.environ for setting the DJANGO_SETTINGS_MODULE.
- Removed unused imports and improved formatting in settings.py.
- Refactored URL patterns in urls.py for better readability and organization.
- Enhanced view functions in views.py for consistency and clarity.
- Added .flake8 configuration for linting and style enforcement.
- Introduced type stubs for django-environ to improve type checking with Pylance.

core/migrations/0001_initial.py

@@ -45,7 +45,8 @@ class Migration(migrations.Migration):
                         name="core_slughi_content_8bbf56_idx",
                     ),
                     models.Index(
-                        fields=["old_slug"], name="core_slughi_old_slu_aaef7f_idx"
+                        fields=["old_slug"],
+                        name="core_slughi_old_slu_aaef7f_idx",
                     ),
                 ],
             },

core/migrations/0002_historicalslug_pageview.py

@@ -71,7 +71,10 @@ class Migration(migrations.Migration):
                     ),
                 ),
                 ("object_id", models.PositiveIntegerField()),
-                ("timestamp", models.DateTimeField(auto_now_add=True, db_index=True)),
+                (
+                    "timestamp",
+                    models.DateTimeField(auto_now_add=True, db_index=True),
+                ),
                 ("ip_address", models.GenericIPAddressField()),
                 ("user_agent", models.CharField(blank=True, max_length=512)),
                 (
@@ -86,7 +89,8 @@ class Migration(migrations.Migration):
             options={
                 "indexes": [
                     models.Index(
-                        fields=["timestamp"], name="core_pagevi_timesta_757ebb_idx"
+                        fields=["timestamp"],
+                        name="core_pagevi_timesta_757ebb_idx",
                     ),
                     models.Index(
                         fields=["content_type", "object_id"],