Change The README To Remove The Heroku-Docker Dependency

[tompurl]

This is related to issue #34.

We need to remove the Heroku-Docker dependency from this application because it is a) broken and b) unnecessary. This change affects the following:

• README.md - The published processes for setting up a dev environment and pushing code need to change.
• ??? - I'm assuming that a few Heroku-related config files will need to change slightly.

I'm happy to help provide some PR's to make this work but I am not a Heroku expert so it might take me a while :-)

[tompurl]

We can close this since PR #36 has been approved.