Check and document the way to use the AF@UNL (without using a notebook): from AF terminal and remotly from user PC

[oshadura]

• [x] Check and document how user should run analysis on AF from AF terminal
• [ ] Check and document how user should run analysis on AF from user's PC terminal

Linked issues: https://github.com/CoffeaTeam/coffea-casa/issues/169

Reported by @kenbloom

[kenbloom]

I think some people are just using python scripts rather than a notebook. Should figure out how to support them.

[oshadura]

@mat-adamec we need to add a section about using AF from terminal in both cases: from AF and from user's laptop terminal

[mat-adamec]

It's been a while since I've seen this topic. Last I remember, there were some issues with how to handle the secrets on a terminal. Were there breakthroughs on this and is using coffea-casa from a terminal currently possible, or does that still need to be investigated?