[w3c/manifest] BREAKING CHANGE: remove serviceworker member (#825)

Closes #800

This change (choose one):

* [X] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [X] Safari (link to issue)
* [X] Chrome (link to issue)
* [X] Firefox (link to issue)
* [X] Edge (public signal)

Commit message:

Removing, as no one implemented the `serviceworker` member.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/825

-- Commit Summary --

  * BREAKING CHANGE: remove serviceworker member

-- File Changes --

    M index.html (223)

-- Patch Links --

https://github.com/w3c/manifest/pull/825.patch
https://github.com/w3c/manifest/pull/825.diff

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