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/staticfiles/admin/js/prepopulate_init.js

@@ -0,0 +1,15 @@
+'use strict';
+{
+    const $ = django.jQuery;
+    const fields = $('#django-admin-prepopulated-fields-constants').data('prepopulatedFields');
+    $.each(fields, function(index, field) {
+        $(
+            '.empty-form .form-row .field-' + field.name +
+            ', .empty-form.form-row .field-' + field.name +
+            ', .empty-form .form-row.field-' + field.name
+        ).addClass('prepopulated_field');
+        $(field.id).data('dependency_list', field.dependency_list).prepopulate(
+            field.dependency_ids, field.maxLength, field.allowUnicode
+        );
+    });
+}