[garrying]

• Fixes the "On this page" highlight, which never worked on pages with heading IDs that start with a digit, such as /get-started/cicd-pipeline/. querySelector("#0-…") threw an error before the scroll listener was attached.
• Replaces righthand.js and scrollRighthand.js with one module script that sets aria-current on the current link. The CSS styles that attribute, so screen readers get the same state as the highlight.
• The current section is now the one whose heading is nearest the top of the viewport, ignoring the bottom half, which matches Chrome's native :target-current

[vercel]

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