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/requirements/base.txt

@@ -45,6 +45,11 @@ django-defender==0.9.7
 # Validation & Serialization
 marshmallow==3.20.1
 
+# Admin Interface
+django-unfold==0.40.0
+django-import-export==4.2.0
+tablib[html,xls,xlsx]==3.7.0
+
 # Utilities
 django-extensions==3.2.3
 django-environ==0.11.2