Implement user authentication system with custom user model, views, and templates

- Created custom User model extending Django's AbstractUser.
- Added user registration, login, and profile views with corresponding templates.
- Implemented user authentication functionality and integrated Bootstrap for styling.
- Updated project settings to use the new accounts app and user model.
- Added tests for user model and admin functionality.

config/urls.py

@@ -12,6 +12,7 @@ if TYPE_CHECKING:
 
 urlpatterns: list[URLResolver] = [
     path(route="admin/", view=admin.site.urls),
+    path(route="accounts/", view=include("accounts.urls", namespace="accounts")),
     path(route="", view=include("twitch.urls", namespace="twitch")),
 ]