We changed the URL from https://github.com/vesoft-inc/nebula to the project page.
If you'd rather we switch to the other URL, let us know and we can do that.
The submitted title ("Show HN: An open-source distributed graph database written in C++") led to lots of arguments, so we changed it in accordance with HN's rules about baity titles. That's in https://news.ycombinator.com/newsguidelines.html.