Generating a Minecraft map as website

I recently started playing Minecraft again with my son, and it was a ton of fun playing together, and also rediscovering all the changes in the game since I played last some years ago. One time I was exploring the world for a bit and then died (bloody skeletons) leaving all my stuff in the middle of nowhere. After trying to find the place where I'd died, I remembered that there used to be a server…