Custom Colors/Theme Config

[claykom]

Is your feature request related to a problem? Please describe.
This is potentially linked to any color related requests

Describe the solution you'd like
I believe a good solution to this would be to allow the use of Hex Color Codes in config to set colors as well as the ability to color each UI feature.

Describe alternatives you've considered
A good alternative to this would be to allow setting color aliases in the config or a sourced file

Additional context
Lazygit implemented a similar feature for setting colors/themes.