As a followup to #696 we should deal with Ruby 2.7 deprecation warnings. Most common issue is:
Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call.

Fairly easy to fix, I suppose.

Currently, as it is documented, you have to manually build the GraphQL endpoint by joining the app.httpURL shown by the deployment process and the path segment /graphql. Some early adopters were certainly confused about it and ended up trying to send GraphQL mutations and queries to the base URL in app.httpURL, having a hard time troubleshooting until they realized. It would be nice to show

Or maybe a whale with little squares on top ... ! Or perhaps an apple!