feat(pi-fff): Improve instructions and add more features

[dmtrKovalenko]

closes #419
So what I've done is simple: I run autoresearch to fine tune the prompts for the best results, then thrown it all away cause autoresearch is a fucking trash and manually fine tuned by running "analyze X" in various repos and asking AI what went wrong

[dmtrKovalenko]

@SamuelLHuber would appreciate your review if you have any objections

[SamuelLHuber]

@SamuelLHuber would appreciate your review if you have any objections

reviewing. may push a fix on install to this branch too. Seems like the fff-node package isn't built or pulled when installing with pi install when using github.

updating here as I go

[dmtrKovalenko]

locally you would need to run make prepare-node but you need rust up and zig 0.16

[SamuelLHuber]

yeah I am trying pi install git:github.com/dmtrKovalenko/fff.nvim/ which executes a npm install from repo root (that seems to not have built the workspace dependency

personally am a fan of git installs over npm (works for dev too + removes the intermediary npm), so i tried that.

What works is

pi install npm:@ff-labs/pi-fff

will update the main README's with that command too #418

seems npm install is easiest.

[SamuelLHuber]

this PR looks good to me.