It's meant to be implemented by a developer, but it doesn't take much skill, and can be hosted for free on a number of services. I was a champion of Netlify well before I became an employee, so I still shamelessly plug them as the way to host static.
Regarding what we're committing, it's definitely human friendly, mostly markdown, or else json/yaml/toml/etc, nothing crazy. It's a completely legitimate use, same kind of data that GitHub's own Pages product uses.