Tidy up the repo

[yuviherziger]

Since the mode of work has been brief flashes of coding, the repository looks accordingly. This ticket is about employing Python and design best-practices to this repo, so that it's easier to maintain.

[yuvalherziger]

Tasks:

• [x] Config classes as @dataclass
• [ ] Move to model-based logic (i.e., no provisioners, just entities)
• [ ] Generic create_container method.
• [x] Reader enum
• [ ] Use dunders wherever possible (e.g., models)
• [ ] Optional: add shorthand aliases to commands, arguments, and flags.