refactor(v2): add support for dark mode to live code blocks #2767
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Motivation
Currently the headings of live code blocks have the same styling for both modes, which doesn't look very good.
For example, in light mode the playground header background should not be so dark:
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
Before:
After:
Related PRs
(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)