Re: [w3c/manifest] scope="../" should be invalid (#551)

```/.well-known/manifest-policy.json``` could list paths from root which are acting like scope borders, like

E.g. for https://github.com/:

https://github.com/.well-known/manifest-policy.json contains ```"scope_borders": ["/"]```, which means e.g. that the widest scope of https://github.com/kenchris/manifest.json  would be https://github.com/kenchris/ etc

Similarly for ```"scope_borders": ["/sites"]``` for https://inventeddomain.com, for https://inventedsite.com/sites/coolsite/data/manifest.json the widest scope would be https://inventedsite.com/sites/coolsite

For ```"additional_scopes"``` we would also need a way for a site to say that it allows itself to become an additional scope of another manifest. ```/.well-known/manifest-policy.json``` could be the right place to define that.




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