It's a Golang thing that reads from a bunch of Markdown files, serves them as HTML but also as Nostr kind 30023 when asked for. It exposes an HTTP interface but also a Nostr relay interface using https://github.com/fiatjaf/khatru.
nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 how did you set up your fiatjaf.com website that is plumbed directly into Nostr (seems to be at least)
Discussion
Interesting stuff, this could be my first venture into creating a relay in order to try this out and I’m happy to do that and get involved in these projects where I can.