Facebook should show a useful preview for my Querki page
Summary: Currently, when I reference a Querki page from FB, I just get the "Loading..." image. What I'd like is the actual content, but that's not trivial.
See
this article, which indicates that FB requires a distinct page for each item in Open Graph. To accomplish this, we'll probably need to do something like it suggests: detect the FB crawler, and redirect to an alternate renderer that produces a version of the page suitable for display. This should probably include the Querki logo, the Thing's Display Name, and the beginning of its rendered view.
Note the implication: we'll need to come up with a URL format for this sort of static-rendered page. This is kind of annoying, but we were going to get there eventually. Don't make this especially fancy, though -- initially, make it display-only, no-login, intended mainly for Anonymous crawler usage.
Obviously, the appropriate security checks should be performed for this. It's effectively an Anonymous hit on the page, and should be treated as such.
