When clicking a link, if mf2 or parsable, present a reader view

[EdwardHinkle]

Some ideas here around parsing links for mf2 for a "reader" display of a url https://chat.indieweb.org/dev/2019-05-30#t1559197752869100

When clicking a link inside the reader it should first, try mf2 if that doesn't exist, maybe try mercury (what Indiepaper uses), or granary/xray for displaying public Social Media posts. If none of the things above work, fallback to opening an in-app safari view controller in reader mode.

There should be a way to bypass this. Either through a setting or by holding on the link or something.