updated comments on gatsby-config

gatsby-config.js

@@ -20,15 +20,27 @@ module.exports = {
     {
       resolve: "gatsby-source-wordpress",
       options: {
+        //Default options are for WP sites hosted on wordpress.com
+        //For sites self hosted and other options check:
+        //https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-source-wordpress
         baseUrl: "gatsbystartercommunity.wordpress.com",
         protocol: "https",
         hostingWPCOM: true,
         useACF: false,
         auth: {
+          //Create a file named .env in root folder of your project
+          //And add there your clientId, clientSecret, WordPressUser and WordPressPassword
+          //More info about environment variables: https://www.gatsbyjs.org/docs/environment-variables
+          //More info about communicate with wordpress.com API: https://developer.wordpress.com/apps/
           wpcom_app_clientId: process.env.WORDPRESS_CLIENT_ID,
           wpcom_app_clientSecret: process.env.WORDPRESS_CLIENT_SECRET,
           wpcom_user: process.env.WORDPRESS_USER,
           wpcom_pass: process.env.WORDPRESS_PASSWORD
+        },
+        searchAndReplaceContentUrls: {
+          //Nested urls won't work. If you find a solution, please fill a PR request
+          sourceUrl: "https://gatsbystartercommunity.wordpress.com",
+          replacementUrl: "https://gatsbystartercommunity.netlify.com"
         }
       }
     },