[openstreetmap/openstreetmap-website] Transform the web site into a fullscreen web app for Android/iOS (#1558)

[plarus]

I have updated my commit only keeping "manifest.json" updates.
This will only have an impact when saving a site bookmark to a device's home screen.

Web App Manifest fundamentals are described here: https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/

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