[w3c/manifest] Tidied up document using tidy-html5 (PR #1222)

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

  https://github.com/w3c/manifest/pull/1222

-- Commit Summary --

  * chore: tidy up index.html

-- File Changes --

    M index.html (15)

-- Patch Links --

https://github.com/w3c/manifest/pull/1222.patch
https://github.com/w3c/manifest/pull/1222.diff

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