[dagit] RFC: Simplify GraphQL Playground usage
We currently require graphql-playground-react in dagit/core, but only to grab its static assets from node_modules and jam them into a vendor directory to be referenced in playground.py.
Instead, check in the static assets and just cp them to the target vendor directory during the build-for-python step.
Open to discussion on this.
Test Plan: Run dagit, navigate to /graphql locally. Verify that the GraphQL playground loads and behaves correctly.
Reviewers: bengotow, prha, sashank, max
Reviewed By: bengotow, max
Differential Revision: https://dagster.phacility.com/D7284