Mountable Rack app for dynamic requests

[brettchalupa]

It'd be great if the GraphQL docs had a server that ccould be mounted in Rails (or whatever framework) and handle requests. This would make the development process really nice where the docs wouldn't have to be regenerated over and over to view them as things are changing. It may be slow? I'm not sure. This could be quite a large change. But it would be nice for development at least instead of relying upon SSG.