It's a git repo and everyone can pull/push directly to master.
I skim the commits once a week.
It's basically plain text files. But the md extension triggers some nice eye candy in vim and other browsers.
I think we will keep this structure forever. Maybe we will (additionally) serve the files over http at some point. Maybe we might even add edit / search / push functions over http, but for now I have not planned that.
I have seen CMS come and go. And I'm tired of it. Text files are forever.