The site is hosted on Google Cloud Run, which seems to have been having some intermittent problems for the last couple of days. EDIT: some other people have had the same issue and the Cloud Run team are investigating
Yep — I added our details to it. I mentioned the problems we were having on Twitter and a Cloud Run PM came to help immediately! So I'm hopeful we'll get a resolution before long. (Aside from this glitch, Cloud Run has been great for us, and we're looking forward to it coming out of beta)