Isolate graphene/graphql implementation from "CreateReactApp"

[genomics-geek]

Description

Would like to isolate the django graphene settings into its own selection. This would allow it to be added to pydanny's cookiecutter w/o having to also use the reactJS stuff.

[genomics-geek]

We could use a similar approach to use_drf but instead would be use_graphql.

This would also impact the React stuff, because if use_graphql == 'y' then we would need to setup React Apollo. If not, we can skip that configuration.