feat(Themes): add pitch black theme

[Importantamigo]

No description provided.

[rushiiMachine]

did you even test this?

[TipsyTheCat]

should be called "black (OLED)" or something with "OLED" in it. it's indistinguishable from the already very dark background used for the dark theme unless you have an OLED screen.
or better yet, just use the OLED friendly background in the dark theme.
edit: to clarify, I had to look at my screen at night to see the difference at the edges of my OLED screen. since normal screens are always lit even on black, there is no way to tell the different between the dark and black themes on them.

[rushiiMachine]

I don't see how adding OLED helps explain the difference to the average user whatsoever.
I for one, still do not know why they call dark themes OLED/AMOLED

[Importantamigo]

I went with black because that's the colour of the background in the colour scheme. The regular dark theme is called dark because while the background is dark, it is not black