Thanks! https://nar-serve.zimbatm.now.sh/robots.txt added.
I like your idea of generating HTML for manpages on the fly.
Depending on the level of interest I want to expand the service to include more overlays like that. For example adding the docker registry API to serve images built with dockerTools.buildImage. Or a naming service that aliases a store path to a hostname for static websites. It really depends on what people are asking for or what I need.