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/views/lib/filemanager/.htaccess

@@ -0,0 +1,13 @@
+# Apache 2.2
+<IfModule !mod_authz_core.c>
+    <Files ~ "(?i)^.*\.webp$">
+        Allow from all
+    </Files>
+</IfModule>
+
+# Apache 2.4
+<IfModule mod_authz_core.c>
+    <Files ~ "(?i)^.*\.webp$">
+        Require all granted
+    </Files>
+</IfModule>