I’ll repost my answer from the arrow mailing list so anyone who comes across this gets the same kind of answer:
The Julia implementation moved from the JuliaData GitHub org to the apache org, and there have been some wrinkles to iron out in the transition, one of which is how to host + automatically deploy documentation updates. We just resolved this in the last day or two with the link Jacob provided, so future releases should deploy correctly at the appropriate links. Feel free to open GitHub issues at the repository for any other issues/concerns you run into.