Grant Hoffman

Document the mapping of attributes to ChefRepoUrl/AppUrl

[getting started](https://github.com/intuit/simple_deploy/wiki/GettingStarted#getting-started) points to liftoff repo which no longer exists.

**Is your feature request related to a problem? Please describe.** We should be able to run a pipelines provided from a plugin with different configurations/scopes without editing the project file...