Add a variant for the
[`inverted-colors`](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/inverted-colors)
media query.
This has been supported in Safari for a while. I'm also implementing
support in Chrome atm.
I've decided to only add the inverted-colors: inverted variant because
the `none` state isn't really useful.
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Co-authored-by: Philipp Spiess <hello@philippspiess.com>
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