feat: add support for design tokens and CSS variables

[xitij2000]

No description provided.

[openedx-webhooks]

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[mphilbrick211]

Hi @xitij2000! Can this PR be closed, or are you still planning to pursue?

[xitij2000]

Hi @xitij2000! Can this PR be closed, or are you still planning to pursue?

I'm still planning to pursue it, but given that the PR it needs (openedx/frontend-platform#440) is still WIP, I'll close it for now to avoid any confusion.

[openedx-webhooks]

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