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.

accounts/apps.py

@@ -0,0 +1,11 @@
+from __future__ import annotations
+
+from django.apps import AppConfig
+
+
+class AccountsConfig(AppConfig):
+    """Configuration for the accounts app."""
+
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "accounts"
+    verbose_name = "Accounts"