Option for dark mode to respect system setting

[willbarkoff]

There should be an option for the dark mode setting to respect the system/browser setting. This can be accomplished with JS:

window.matchMedia('(prefers-color-scheme: dark)').matches

matchMedia is available in ~98% of browsers, and prefers-color-scheme is available in ~84% of browsers

[myhomeworkspace-planbot]

Hi! I've removed @willbarkoff from this issue due to a lack of activity. If this is a mistake, feel free to reassign yourself. If you would like to work on this issue, feel free to assign yourself.