[Feature Request] Choose theme using prefers-color-scheme media query

[comex]

It would be nice if Yomichan had an option to automatically switch between dark and light theme depending on the OS color scheme, based on the prefers-color-scheme CSS media query.

(This would be especially useful to me because I've been using the macOS feature where the OS alternates between light and dark theme depending on the time of day, so I can't just pick a theme in Yomichan's settings and be done with it...)