Grav is a modern open source flat-file CMS
You can read this text so I guess it works.
- Easy to install
- UX similar to wordpress
- operates on files instead of a database
- Markdown content editor with syntax highlighting
- Twig Templates
It's a very nice match for my needs. I tested a lot of static site generators but was not happy with the user experience. Also having a webinterface is nice.
I also tried out ghost but their website is a mess and the self-hosting documentation is outdated, and to be honest I have begun preferring PHP applications to node.js applications as they tend to be more robust and lightweight in my personal experience.