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.

.vscode/settings.json

@@ -13,6 +13,7 @@
         "Hellsén",
         "isort",
         "Joakim",
+        "kwargs",
         "lovinator",
         "Mailgun",
         "makemigrations",