added a check for an existing portfolio page when trying to create a …

…new archive page

If, after importing the demo, an archive portfolio page has already been added, then there is no need to create it again. You just need to add it to the option and define it in the plugin as an archive page

classes/class-archive-mapping.php

@@ -1065,8 +1065,8 @@ public static function create_archive_page( $custom_slug = 'portfolio' ) {
 				'post_name'     => $custom_slug,
 			);
 
-			// Insert the post into the database.
-			$post_id = wp_insert_post( $args );
+			// Check page if Archive Exist and set as Portfolio page or Insert the post into the database.
+			$post_id = self::get_unset_archive_page() ?? wp_insert_post( $args );
 
 			if ( ! is_wp_error( $post_id ) ) {