_content: show anchor links when hovering over article headers

[ysam12345]

Previously, users had to hover directly over the ¶ symbol to reveal the
anchor link, making it difficult to discover its existence.

This change updates the CSS to also display the anchor link when hovering
over the entire header text, improving usability.

Fixes golang/go#70827

[ysam12345]

Original behavior - need to hover on anchor symbol

New behavior - display anchor when hovering on header text as well

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