Update CLI for better user experience

[AvishaiEZen]

Background

1. powerpwn could have better CLI capabilities, to better interact with users and guide them (similarly to other attack tools).
2. Some of the content should be based upon the updated documentation (TBD after https://github.com/mbrg/power-pwn/issues/29).

Def done

1. Perform required code & documentation updates to address the above.
2. Open follow up issues as required.
3. Inquire with users regarding task success (this is a CLI that new users should find friendly) and iterate.