Black theme support

[toboil-features]

I love disabled diodes on my OLED screen at night, or just call it pure black color. Please add it.

P.S. Surprisingly good app, thanks for your work.

[DeweyReed]

Hi, the app already supports dark theme. It's the first entry in the app settings.

[toboil-features]

Dark theme ≠ black theme

I haven't found the way to explicitly select black theme in Dark Theme section, nor in App Theme.

[DeweyReed]

After enabling manual dark theme, you can turn it on at the bottom of the app drawer.

The black theme will require some work.