Add categories name to Algolia

[w3bdesign]

https://github.com/JoseSanchez54/algolia-woo-indexer/commit/316a6e28485d0a7563c953705a915706b3cd587a

https://github.com/JoseSanchez54/algolia-woo-indexer/commit/89420903847b98d750353e1879a948a9962d5ed4

[w3bdesign]

	$get_categories = explode(',', wp_strip_all_tags(wc_get_product_category_list($product->get_id()), false));

            preg_match('/<img(.*)src(.*)=(.*)"(.*)"/U', $product->get_image(), $result);
            $product_image = array_pop($result);

            $record['objectID']               = $product->get_id();
            $record['product_name']           = $product->get_name();
            $record['product_image']          = $product_image;
            $record['short_description']      = $product->get_short_description();
            $record['regular_price']              = $regular_price;
            $record['sale_price']                   = $sale_price;
            $record['on_sale']                        = $product->is_on_sale();
            $record['categories']                   = $get_categories;
            $records[] = $record;