Since 6917060, docker compose relies on an oauth.env file to get
the OAuth parameters, so the Makefile is updated to handle here
this change. In addition, the README is updated.
README now starts with the assumption that docker is setup.
The discrete volume, notebook, pull steps are also moved to "Behind the scenes",
and implied in `make build` in the setup.
Getting started is now:
1. GitHub OAuth
2. SSL
3. userlist
4. `make build`
5. `docker-compose up`
The script was meant to facilitate hub build and run operations
while shielding new Docker users from `docker-compose`. It now
provides very little functionality, and even gets in the way if
specifying GITHUB oauth environment variables in the .env file.
(c) Copyright IBM Corp. 2016
