Add Creative Elements templates and update index files

- Introduced new templates for catalog, checkout, contact, and error pages.
- Implemented caching headers and redirection in index.php files across various directories.
- Enhanced product and layout templates for better integration with Creative Elements.
- Added backoffice header styles and scripts for improved UI/UX in the admin panel.

modules/creativeelements/override/classes/CMSCategory.php

@@ -0,0 +1,28 @@
+<?php
+/**
+ * Creative Elements - live Theme & Page Builder
+ *
+ * @author    WebshopWorks
+ * @copyright 2019-2022 WebshopWorks.com
+ * @license   One domain support license
+ */
+
+defined('_PS_VERSION_') or die;
+
+class CMSCategory extends CMSCategoryCore
+{
+    const CE_OVERRIDE = true;
+
+    public function __construct($id = null, $idLang = null)
+    {
+        parent::__construct($id, $idLang);
+
+        $ctrl = Context::getContext()->controller;
+        if ($ctrl instanceof CmsController && !CmsController::$initialized && !$this->active && Tools::getIsset('id_employee') && Tools::getIsset('adtoken')) {
+            $tab = 'AdminCmsContent';
+            if (Tools::getAdminToken($tab . (int) Tab::getIdFromClassName($tab) . (int) Tools::getValue('id_employee')) == Tools::getValue('adtoken')) {
+                $this->active = 1;
+            }
+        }
+    }
+}