The code for HealthCare.gov is actually Open Source on GitHub
github.com
github.com
Isn't that the default image? Their real graphs show only 1 contributor and 1 commit.
https://github.com/CMSgov/healthcare.gov/pulls
Doesn't look like they're doing much updating, though. I don't know if that's standard operating procedure on gov't websites (which, let's face it, have lots of clunky requirements that other websites won't have) or if this repo is just for public show.
It's at least educational...for anyone who doesn't know how flexible Jekyll can be, this is a full fledged installation. You can create and deploy your own flat-file health care site in minutes. That's a very cool concept, actually, and probably never been done before with a government website.