Refactor all remaining scripts

[ehmatthes]

This refactoring work has been really helpful. Finish that work before moving on to deployment summaries and the plugin model.

• [x] cli.py
• [ ] Run black against entire project.

[ehmatthes]

Tasks common to more than one platform

• [ ] Select from multiple possible resources. ie orgs for Platform.sh, project names for Fly.

[ehmatthes]

Closed in favor of #333.