[w3c/manifest] Obtain manifests only using the JSON MIME type (#858)

Closes #821

This change (choose one):

* [X] Adds new normative requirements

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] [Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1626158)
* [ ] Edge (public signal)

Commit message:

When obtaining a manifest, this now checks the mime type is a JSON mime type. We also now export the mime type from our spec. 

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

  https://github.com/w3c/manifest/pull/858

-- Commit Summary --

  * Obtain manifests only using the JSON MIME type

-- File Changes --

    M index.html (34)

-- Patch Links --

https://github.com/w3c/manifest/pull/858.patch
https://github.com/w3c/manifest/pull/858.diff

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