Implement activity dereferencer as a liquid variable
It should be fairly easy to add the activity to the page (I think we already do) as a liquid drop and use stuff like {{ page.activity.attributedTo.name
where attributedTo
is a link to another JSON-LD object that's fetched on demand.
It'd be better still if we could snake_case the dromedaryCase attributes, probably with some meta-programming, though I remember seeing a gem that did the trick, but can't remember its name.
This will be important when we start adding AP support to templates and sites.