feat(tokens): generate dark charts tokens file

[srambach]

@lboehling @mcoker Please verify that 1) the tokens that have changed in _tokens-charts.scss look correct and 2) the contents of _tokens-charts-dark.scss look correct and that's the way we want to have the tokens arranged in the files.

Fixes #32

[mcoker]

IMO we can call the chart tokens whatever we want as long as we have vars for all of the style bits that existed before. I'll defer to @lboehling on the naming unless you'd like some specific feedback from me. What's there looks good to me though! 👍👍

[lboehling]

Everything in there looks correct to me, too! I tried to keep the variables similarly named to current charts because I wasn't familiar with how victory consumed them. I'm open to adjusting the names if we want them to be more semantic.

I do not see any of the string variables I entered in Figma, though.

I wasn't sure if these would export properly from Figma, so maybe that's just a limit to what Figma variables can do?

[srambach]

Hmm. @lboehling those variables aren't getting exported to the .json so that's why they aren't in the .scss. I'll put in an issue to find out why.

[srambach]

Follow up to get string variables: #34

[github-actions[bot]]

:tada: This PR is included in version 1.1.0 :tada:

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• GitHub release
• npm package (@prerelease dist-tag)

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