[w3c/manifest] Moves BeforeInstallPrompt and related text to a non-normative annex. (#843)

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:

* [X] Safari (commitment to not implement — #835)
* [X] Chrome (acknowledgment of removal from standard — #836)
* [X] Firefox (commitment to not implement — https://github.com/mozilla/standards-positions/issues/84)
* [X] Edge (acknowledgment of removal from standard — #836)

Commit message:

Due to lack of multiple implementations, BeforeInstallPrompt is being removed
from the standard.

However, the event is going to continue to exist in Chromium-based browsers, and
has widespread use on the web. Therefore, instead of removing it from this
specification document, it is being moved into a non-normative annex, which
clearly states that the feature does not need to be implemented for standards
compliance, but provides a place to host the text for implementations that wish
to participate.

Closes #835.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/843


-- Commit Summary --

  * Moves BeforeInstallPrompt and related text to a non-normative annex.

-- File Changes --

    M index.html (531)

-- Patch Links --

https://github.com/w3c/manifest/pull/843.patch

https://github.com/w3c/manifest/pull/843.diff


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