Using Grav CMS [0] from my SaaS side projects blog. Pretty much what you've described. Light, clean and simple, easy to manage back end (PHP). So far so good!

Using Grav CMS [0] from my SaaS side projects blog. Pretty much what you've described. Light, clean and simple, easy to manage back end (PHP). So far so good! [0] https://getgrav.org/ https://getgrav.org/