Support for Color e-ink displays/Theme Support

**Is your feature request related to a problem? Please describe.**
No, although I would personally find a lack of colors a problem. It's not a functional problem.

**Describe the solution you'd like**
It would be nice/fun if the pwnagotchi allowed you to set custom colour/theme profiles in the configuration. Enabling users to use their colored e-ink displays to their full potential.

I'm aware that you can flip the BLACK and WHITE variable (0x00 and 0xff) around to get an inverted appearance. But I think it would be rather nice to be able to be able to tweak this as well as colour without having to adjust the python files themselves.

e.g:
```
Theme:
Face: RED
Text: WHITE
Background: BLACK
Plugins:
UPS-Lite: RED
```

**Describe alternatives you've considered**
An alternative would require the adjustment of the python files themselves, which might break with each update of the pwnagotchi

**Additional context**
This probably isn't super high on the to-do list, since it's a novel thing if anything. But I still like colour in my life dammit!