[w3c/manifest] Improve references and minor fixups (#656)

Improves references, ie remove unused ones, order better in an index.

Update Type(x) usage to follow ECMAScript spec better
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/656

-- Commit Summary --

  * Improve references and minor fixups

-- File Changes --

    M index.html (776)

-- Patch Links --

https://github.com/w3c/manifest/pull/656.patch
https://github.com/w3c/manifest/pull/656.diff

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