Add workaround to avoid duplicating theme css #5323
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In order to support both a theme toggle and to automatically use the user's selected theme based on browser/system defaults the stylesheets has to be duplicated twice since the latter requires the css to be wrapped around a media query. This duplication is a painful experience to deal with when adding or changing existing styles. Even more so when it involves jumping around the behemoth default.css from and back to whatever sections you were just working on. I don't believe the we the Invidious team will be able to agree to a proper solution anytime soon (eg css post-processor, modern css light-dark feature, etc) so this commit is here as a stopgap measure. The workaround is to move the theming styles to two separate files which are read at runtime and used to generate a combined stylesheet with the necessary duplication for the media query. This combined stylesheet is then delivered on a new route added to Invidious, bypassing the static file handler.
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This PR is a stop-gap measure to prevent having to duplicate the theming styles two times for each theme, and to avoid the pains of having to jump around the behemoth default.css file whilst duplicating the theme color.
Until we can agree to a proper solution this at least makes adding and changing colors much less of a headache.
Of course there's still some duplication in that you still need to define the selectors twice (once for light and once for dark) but I don't think this can be fixed by anything short of an actual CSS pre-processor.
Closes #5056