Refactor configuration options

[gegoune]

Is your feature request related to a problem? Please describe.
Options aren't 'in the same direction' at the moment. Would be nice to remove disable_ strings from them and switch bools around.

{
  disable_signs = false,
  disable_hint = false,
  disable_context_highlighting = false,
  disable_commit_confirmation = false,
  auto_refresh = true,
  disable_builtin_notifications = false,
}

This is subset of current options. Please note how auto_refresh is 'positive' while all others are 'negative' (disable_).

Describe the solution you'd like
It would probably make sense to group related options into subtable and turn them around, so instead of disable_signs = false default would be signs = true, but also would be nested into, let's say, display subtable (display.signs = true).

Describe alternatives you've considered
Leave things as they are but setup table will eventually become polluted.

Additional context
#225 (comment)

[CKolkey]

@treatybreaker this could be something nice to do, yea?

[PriceHiller]

@treatybreaker this could be something nice to do, yea?

Yeah, this would be solid. Not sure about the nested scope though. I don't think there's a ton of value in nesting the scope unless there's other values within that scope or we have repeated similar configs like with the kind stuff for commit_editor, commit_view, etc.

[CKolkey]

Dealers choice, I'm mostly interested in flipping the negative (disable_commit_confirm = true) into the positive commit_confirm = true

[D00mch]

The pull request with the fix is here #1556