Support dark mode in Studio

[omesser]

Dark mode is not supported today so Studio is bright and shiny! 🌤️ 🌞

as a workaround, not official and superficially tested - the Dark Reader chrome extension seems to be functioning reasonably (while other extensions I've tried are broken with studio) It's ugly, but works

dark mode screenshot

[dvnatanael]

Note that plots will still be rendered in "light mode" with a white background when using the extension.