Would you like a PR for this? apollo-server-hapi graphqlplayground-specific path question

[maxnachlinger]

We have a need to lock down the graphql playground in our production graphql instances, but we'd like our awesome colleagues to be able to use it. Obviously we need to write some kind of auth thing :) It would be simpler to protect access to the graphql playground if had its own path. Would you guys be open to a PR to add that graphql playground-specific path?

[maxnachlinger]

Nevermind, I see #1974 :)