This was still linked from the v2 getting started page. While it will
eventually link to the "Deployment" guide index page where we'll offer
guides for other deployment options, that content is not written.
For now, we'll offer those getting statred to deploy with Heroku, which is
written!
Ref: https://twitter.com/jevakallio/status/1007915638919192577
cc (and thanks) to @jevakallio for pointing this out.
While the `gql` tag is not currently _required_, it does make it easier to
implement additional, development-friendly functionality in the future.
For example, it could avoid the need to question whether a string literal is
actually using Schema Definition Language (SDL) and avoid the need to
look for context clues.
By implementing these suggestions now, we can avoid the need to ask
developers to refactor in the future.
