[w3c/manifest] Tidied up document using tidy-html5 (PR #1200)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1200.html" title="Last updated on Jan 5, 2026, 5:44 PM UTC (b19e00f)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1200/d79d9ca...b19e00f.html" title="Last updated on Jan 5, 2026, 5:44 PM UTC (b19e00f)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1200

-- Commit Summary --

  * chore: tidy up index.html

-- File Changes --

    M index.html (54)

-- Patch Links --

https://github.com/w3c/manifest/pull/1200.patch
https://github.com/w3c/manifest/pull/1200.diff

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