[w3c/manifest] Tidied up document using tidy-html5 (PR #1217)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1217.html" title="Last updated on May 7, 2026, 11:53 AM UTC (c8ec522)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1217/5cd886a...c8ec522.html" title="Last updated on May 7, 2026, 11:53 AM UTC (c8ec522)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1217

-- Commit Summary --

  * chore: tidy up index.html

-- File Changes --

    M index.html (31)

-- Patch Links --

https://github.com/w3c/manifest/pull/1217.patchhttps://github.com/w3c/manifest/pull/1217.diff
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