[w3c/manifest] WIP: Let HTML handler obtaining (#894)

Closes #891 
Closes #778
Closes #826

HTML pull request https://github.com/whatwg/html/pull/5581

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 (link to issue)
* [ ] Edge (public signal)

Commit message:

Use HTML's link relationship machinery to handle all the obtaining. We just deal with processing. 

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

  https://github.com/w3c/manifest/pull/894

-- Commit Summary --

  * WIP: Let HTML handler obtaining

-- File Changes --

    M index.html (293)

-- Patch Links --

https://github.com/w3c/manifest/pull/894.patch
https://github.com/w3c/manifest/pull/894.diff

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