Replace Github link with official link

https://wordpress.org/plugins/wp-graphql/

Author: w3bdesign

README.md

@@ -7,7 +7,7 @@
 1. Install and activate the following required plugins, in your WordPress plugin directory:
 
 - [woocommerce](https://wordpress.org/plugins/woocommerce) Ecommerce for WordPress.
-- [wp-graphql](https://github.com/wp-graphql/wp-graphql) Exposes GraphQL for WordPress.
+- [wp-graphql](https://wordpress.org/plugins/wp-graphql) Exposes GraphQL for WordPress.
 - [wp-graphql-woocommerce](https://github.com/wp-graphql/wp-graphql-woocommerce) Adds WooCommerce functionality to a WPGraphQL schema.
 - [algolia-woo-indexer](https://github.com/w3bdesign/algolia-woo-indexer) Sends WooCommerce products to Algolia. Required for search to work.