Retrofit templates to work with Graphback

[craicoverflow]

This PR adds the necessary configurations for each template to work with Graphback.

Graphback generates your GraphQL schema, resolvers and database and provides a set of runtime libraries to connect to a database of your choice.

Why

These boilerplates are still using graphql-yoga and Prisma 1 which are in maintenance mode.

Tasks

• Add a .graphlrc graphql-config to each template with graphback configuration
• Replace graphql-yoga with apollo-server-express for server setup
• Add generated resolvers and schema
• Add data sources and runtime libraries (where applicable)

Verification

advanced

1. Run docker-compose up -d to start MongoDB
2. Run yarn to install dependencies
3. Run yarn start.
4. Execute the mutations in seed.graphql from the playground

basic:

1. Run yarn install
2. Run yarn start

advanced:

1. Run yarn install
2. Run docker-compose up -d
3. Run yarn start

[wtrocki]

@kamilkisiela @ardatan we have started processing graphql-boilerplates to support graphql-cli. Codegen and other commands will be added as well