Remove non-root swagger definitions

[cap10morgan]

As per discussion in metosin/reitit#589 (comment) this removes the non-root :definitions from the swagger output.

[cap10morgan]

I removed all of the trailing commas in the swagger-test data in 26bda9b, but let me know if you'd rather I not do that. I was having to remove the ones from the deleted non-root definitions in the test expectations and decided it might be better to just clean it all up in one commit first.

[cap10morgan]

The one failing test also failed before my changes.

[opqdonut]

Thanks for removing the commas in a separate commit!

All tests seem to pass now. The failures were caused by a clojars outage, but now all the deps downloaded fine and the tests passed as well.

I have a nagging thought that the :definitions inside :schema might be worth leaving in. I'll investigate a bit and see what various validators say.

[opqdonut]

Ok, we only need the top-level :definitions since all the references are of the form "$ref": "#/definitions/.... I think this is good to go.

[opqdonut]

I'll merge this later today

[cap10morgan]

OK, and now with this merged reitit-malli's test expectations need to be updated, at least. I'll work up a PR for that push those changes to the existing PR later today.