Yeah, the open-sourcing process seemed to have destroyed all documentation.

There are still 3-rd party sites with copy of the docs, like https://docs.comment.workcanvas.com/ (full of dead links), but it seems the main site used to be "cord.com" and this is already sold to some job search site.

I am surprised they did not open source the doc... or maybe no one has bothered to bring up the server?