Tone down the brightness of the dashboard panel by using a white background behind the main text, and use the highlight color from each color scheme for the main background. This also introduces a `$scheme-name` SCSS variable to allow overrides for specific color schemes.
Props critterverse, sabernhardt, joedolson, audrasjb.
See #54489.
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* No more border-width, border-style, border-color insanity.
* Point releases are much less likely to require extra finagling to avoid rebuilding the color schemes.
* Yours truly has a better overall vision of ~14,000 lines of admin CSS and where we go from here.
1,065 net lines of red, y'all.
props helen, jorbin. fixes#18380.
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