..huh, yep, you're right. That's.. super embarrassing and huge screw up on my part, uhg. I was 100% positive I submitted the order through Namecheap before pushing the repo up to GitHub for this exact reason, and that it went through.. but yeah, looks like I didn't and we don't own it. :(
Good news is we've got doctree.org, so will be using that instead. I've removed all references to the other domain.