Add email templates for user notifications and account management

- Created a base email template (base.html) for consistent styling across all emails.
- Added moderation approval email template (moderation_approved.html) to notify users of approved submissions.
- Added moderation rejection email template (moderation_rejected.html) to inform users of required changes for their submissions.
- Created password reset email template (password_reset.html) for users requesting to reset their passwords.
- Developed a welcome email template (welcome.html) to greet new users and provide account details and tips for using ThrillWiki.

django/config/__init__.py

@@ -0,0 +1,11 @@
+"""
+ThrillWiki Django configuration package.
+
+This module ensures the Celery app is loaded when Django starts
+so that @shared_task decorators can use it.
+"""
+
+# Load Celery app when Django starts
+from .celery import app as celery_app
+
+__all__ = ('celery_app',)