Re: [w3c/manifest] Manifest processing should not be a function of document URL (#668)

> The reality is a document is required to install an app. Sure, you can INDEX an app (it's name, icons, etc) but to me that is not INSTALLING an app.
> 
> The installation of an app requires a document.

I was thinking about this very thing. For digital catalogs, [the `start_url` is really required](#issuecomment-795803697) because otherwise there’s no "there" there; you wouldn’t even have a domain to work from.

So, to go back to @mgiuca’s initial recommendation (and this PR), I’m all for making `start_url` required in Manifest (with a sensible upgrade plan in place, as Matt’s outlined in the PR). Moreover, I feel like the `start_url` (even the inferred one) should step in as the "document" in order to facilitate installation (see comments about CORS, etc.).

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