WIP: expose column-gap as a CSS var for PageLayout

[langermank]

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• [ ] Added/updated tests
• [ ] Added/updated documentation
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• [ ] Changes are SSR compatible
• [ ] Tested in Chrome
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• [ ] (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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Latest commit: eec49dff0d78361fa05c9f64f8299ff3a0cecc37

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[github-actions[bot]]

:wave: Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions[bot]]

Hi! This pull request has been marked as stale because it has been open with no activity for 60 days. You can comment on the pull request or remove the stale label to keep it open. If you do nothing, this pull request will be closed in 7 days.