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/change_form.js

@@ -0,0 +1,16 @@
+'use strict';
+{
+    const inputTags = ['BUTTON', 'INPUT', 'SELECT', 'TEXTAREA'];
+    const modelName = document.getElementById('django-admin-form-add-constants').dataset.modelName;
+    if (modelName) {
+        const form = document.getElementById(modelName + '_form');
+        for (const element of form.elements) {
+            // HTMLElement.offsetParent returns null when the element is not
+            // rendered.
+            if (inputTags.includes(element.tagName) && !element.disabled && element.offsetParent) {
+                element.focus();
+                break;
+            }
+        }
+    }
+}