Dark mode not aligned with Github

Hello,

Thanks for the extension!

I use it a lot, but the dark mode is a bit broken: it stays aligned with my OS instead of GitHub. (so light when I have GitHub in dark mode).

I would expect the extension to follow the settings by order of specificity (GitHub> browser > OS), or to have an explicit setting, like it had in the past.

Also, the dark colors are the default, but are not really aligned with github's variations, like the "dark dimmed" theme, that seems much more comfortable. Would you consider adding this?

Thanks a lot!