Add docker for backend use

[higgins]

If the API is going to run on heroku docker, here are a few proposed to changes to get that going. Namely:

1. Extract a few variables in backend into .env file and hydrate them via dotenv
2. Move all the server's runtime dependencies under src dir
3. Add a "DREAM_ENV" environment variable which represents which environment the app will run in (ie development/production)
4. Don't allow localhost for non development environments.
5. Add a few npm dependencies that were referenced in server but not in package.json
6. Update the package-lock.json for frontend

[DashBarkHuss]

Should now be
"main": "backend/src/server.js",

[higgins]

good catch! i think since this is in the backend dir though it should be src/server.js. unless you want to rollup the dependencies into one package.json at the root of this repo.

updated here: d6c8a39

[higgins]

hey @DashBarkHuss i'm doing some house keeping and will close this as I haven't given it much thought since its inception! ✌️