I’m the creator of Markdoc (http://markdoc.org/ http://markdoc.org/), which is pretty simple (bias bias bias bias) but it's just plain-text files in a directory

I’m the creator of Markdoc (http://markdoc.org/ http://markdoc.org/), which is pretty simple (bias bias bias bias) but it's just plain-text files in a directory, which means you’ll need to be comfortable with a text editor and a version control system.