@skyfaller Ghost, set up as a headless CMS: https://ghost.org/docs/jamstack/

If you get past their "content maker" marketing, you'll discover that it's dead-simple to use for non-technical users. Very Medium-like editing experience, very low possibility of a major screw up (assuming no admin access).

I can't vouch for Hugo compatibility though, it works with my static site generator of choice (11ty).