[w3c/manifest] Add navigation_ui property (fixes #765). (#766)

Closes #765 

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [X] 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):

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

Commit message: add navigation_ui property

Adds hint in the manifest regarding the visibility of the navigation ui.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/766

-- Commit Summary --

  * Add navigation_ui property (fixes #765).

-- File Changes --

    M index.html (75)

-- Patch Links --

https://github.com/w3c/manifest/pull/766.patch
https://github.com/w3c/manifest/pull/766.diff

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