Wow, gitignore is an OSS project?! Didn't know this. Are you looking for collaborators? Love your project and have been looking for something to tinker with on free time. Kudos for great work!
The gitignore.io site is OSS as well as the gitignore template list maintained by GitHub. If you want to collaborate that would be cool, although there isn't much the site does :). All I've been doing recently is merging pull requests and updating submodule.