WordPress isn't just for blogs and I think it might fit your use case for documenting a set of API endpoint. There is likely a free swagger plugin in WordPress that would help you, although I hadn't really looked.

Other than that, you could look at using a static site generator like MkDocs or Docusaurus. It'll generate a site of HTML pages, and you could either manually upload them to your host, or you could set up an automation that updates your host when you merge changes into git.

I think my response illustrates another problem with modern tools compared to the 90s - there isn't any single tool that edits HTML/CSS and upload them. You now have to glue together several tools.