So is it CC0 (public domain)?
No, it is CC BY. Feel free to use and adapt it for any commercial projects. Thanks for the heads up, I will change the description to include this. :)
In this case you should add license metadata. Read here how to do it. And when you add link to the license, I would advise you to add link to concrete license rather than link to the list of brief descriptions of all cc licenses...
