[express-apollo-prisma] Final cleanup from demo feedback

[kenslachtajr]

Description

• Following our demo on 3/22, the items below are the items that must be corrected in order to finalize the express-apollo-prisma starter kit. Here is a link to the demo: https://drive.google.com/file/d/1pGrON2uADtJ0XEk1lGABmRY2GE8cwnej/view

• [x] GraphQL naming conventions

• [x] Update README and link to accompanying blog post explaining limitations

• [x] Clean up the scripts (yarn start, yarn test etc)

• [x] Fix linting issues (exclude .yaml files)

• [x] .env globally available with running queue (optional)