[w3c/manifest] Editorial: switch completely to infra types (#992)

Closes #984 

CC @phoglenix

This change (choose at least one, delete ones that don't apply):

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

Entirely removes reliance on JS object types, and now solely uses Infra types throughout.

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

  https://github.com/w3c/manifest/pull/992

-- Commit Summary --

  * Refactor: switch completely to infra types

-- File Changes --

    M index.html (355)

-- Patch Links --

https://github.com/w3c/manifest/pull/992.patch
https://github.com/w3c/manifest/pull/992.diff

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