Setup web+ap handler with the PWA

[SoniEx2]

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There should be an easy way to open the app from a link.

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It would be cool if this supported web+ap using the PWA. This is probably the cleanest approach.

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The most widely supported approach to opening the user's preferred fedi app is using web+ap, as it is supported in the feditext and tokodon native clients. While there are other ways a webapp can solve this problem (implementing webfinger and taking advantage of the remote interactions dialog, for example), they're not really viable for this app (because it uses static pages).

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