It looks like a legit open source project. Strange that you would see any ads on it. I see zero ads but I also have uBlock.
Edit: I just opened it with ads. Looks like a basic ad setup, but there are a few places where the ads are inserted on the page. Looks a bit excessive but maybe some of them are supposed to be smaller ads instead of big header ads like we see. It could be a typo in their template or something.
I presume the ad spammers spammed it onto the front page of HN to pump up the ad views.