OP wanted a simple web server for serving static content. Are you aware of open CVEs? No? It's possible for software to be done you know. Just because something isn't a rolling release of change for the sake of change (like most Google crapware) doesn't mean it isn't fit for purpose.
Considering the vast majority of commit were made after 2016, I don't think it is "done".
And a C program, written by a single developer, with only 27 issues ever being filed? With all due respect, that's guaranteed to have some nasty bugs in there.