Use nodemon for start script

[DevanB]

I've noticed that in the front-end related graphql-boilerplates, we are asking users to start the front-end application and open another tab to start the server.

I propose we change the scripts in these repositories to use nodemon and start both the front-end and server applications through the start script. In addition, we could create a start:server and start:application (or start:app, start:frontend) scripts to start the individual pieces.

This affords the user the ability to start quicker, and the server to still pick up changes on save.

[vivek12345]

I can take this @DevanB