GraphQL in Gatsby
When you run the gatsby develop command and it completes, you will see a link
to your locally running graphiQL instance. You can get to it by going to
http://localhost:8000/___graphql in your browser.
Challenge: Play around with GraphiQL and see what kind of data currently exists in your Gatsby site.
Gatsby uses different source plugins to allow you to query different types of data from various sources. We will mainly be focusing on pulling data from Drupal and the local filesystem.