Introduce CLI to operate on POAM sheets

[cjllanwarne]

The browser based UI app POC was a useful learning experience but what we really need is:

• To use a conmon POAM spreadsheet as the source of truth, not a separate database
• To perform some basic actions for the weekly and monthly check-ins, like:
  • Downloading alerts
  • Converting findings and alerts files from trivy, zap and CIS into a comparable format with POAMs
  • Diff and combine findings with preexisting POAM sets
• To do this from a CLI at first

Therefore:

• Archive (or remove? Or just ignore?) the existing UI app
• Introduce a CLI
• Be able to run the weekly and monthly security actions through the CLI