Interesting issue with Gatsby when using the Lessons sample application

Hello there.

I had a strange issue today when setting up Gatsby with Contentful. I’ve written it all up as a Github issue so I thought I’d share it here. I thought the Contentful Devs might be interested in this themselves, as when things don’t work with mostly vanilla settings, it’s easy to see how people could be turned off the platform: https://github.com/gatsbyjs/gatsby/issues/17875