[w3c/manifest] BREAKING CHANGE: remove beforeinstallprompt event (#836)

Closes #835 

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 - never implemented.
* [ ] Chrome (link to issue)
* [X] Firefox - never shipped. 
* [ ] Edge (public signal)

Commit message:

As discussed in #835, the proposal is to remove "beforeinstallprompt" and leave it to browsers to provide better UI to surface installability of web applications.  

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

  https://github.com/w3c/manifest/pull/836

-- Commit Summary --

  * BREAKING CHANGE: remove beforeinstallprompt event

-- File Changes --

    M index.html (321)

-- Patch Links --

https://github.com/w3c/manifest/pull/836.patch
https://github.com/w3c/manifest/pull/836.diff

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