There a new sheriff in town. https://github.com/jqlang is a new organization intended to maintain jq
going forward. The original maintainers have pretty much abandoned it: the last release, v1.6, is dated Nov 1, 2018
Unfortunately, the documentation did not follow it: https://stedolan.github.io/jq now redirects to https://jqlang.github.io/jq, but the jqlang people have not created their jqlang.github.io
repo.
Until this gets resolved, https://github.com/jqlang/jq/blob/master/docs/content/manual/v1.6/manual.yml is the manual online.
I’ve raised this issue on the jqlang discord. We’ll see how long it takes to get fixed. I’d raise an issue in the jqlang/jq repo, but there are literally 10 years of issues open.