chg: fix #85 #163 revise managing feeds and figs

[chrisinmtown]

Update managing feeds so figures and text match MISP v2.4.137 features

[chrisinmtown]

I would like to add reviewers here like @adulau and @Wachizungu but don't see a way to do that, am I blind today?

[Wachizungu]

I'm guessing only the members of the project can do certain actions like adding reviewers.

I'm just a contributor myself so I also count on the reviews from core MISP team. They keep an eye on the projects / pull requests so they'll pick it up and review when they have some time don't worry. There's no need to specifically ping them.

As for my feedback:
To me it looks nice :D, happy to see the overlap analysis in there. Glad to see contribution from more people as well! I am not an active user of the feeds myself (yet) though so I'll not say more than that on this PR. I'm planning to have a look into feeds myself the next month so if I figure something extra out I'll probably add it on here as well.

[iglocska]

Awesome, thanks a lot, much clearer than what we had before!