[STORY] Super Easy Install

[jonpugh]

As a web developer I want to install terra and docker quickly and easily So that I can do my job without a lot of work.

• [ ] When detecting docker and docker compose (and docker machine), output links to the install documentation for terra.
• [x] Add terra to packagist.org.
• [x] Add documentation on how to install Terra globally (using drush as an example)
• [x] Figure out how to automatically run composer install within the project after composer global require