Wrapped .masthead-brand in <a href="index.html"> in both digest.html.j2
and archive.html.j2 so the hero is a clickable shortcut to the latest
edition. Useful when reading an archived edition and you want to jump
back to the freshest one without going through the archive list.
CSS: color: inherit + text-decoration: none keeps the visual
identical; hover drops opacity to 0.85 for affordance; focus-visible
gets an accent outline so keyboard nav is discoverable.
vh
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