[w3c/manifest] Tidied up document using tidy-html5 (PR #1028)

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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1028

-- Commit Summary --

  * chore: tidy up index.html

-- File Changes --

    M index.html (22)

-- Patch Links --

https://github.com/w3c/manifest/pull/1028.patch
https://github.com/w3c/manifest/pull/1028.diff

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