[wiki] Add CSS variables docs to our Emotion wiki #7145
Merged
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Summary
Adds an example of how components can set CSS variables. Ideally should also clearly explain when to use CSS variables, but I'm not sure this is totally clear and my brain is a little fried right now, so would appreciate feedback.
BTW, I definitely anticipate us tweaking these docs more as we move on to converting form components to and actually have to set up CSS variables for them.
QA
General checklist
N/A, wiki/docs only