If you haven't looked at Jekyll, I'd look at it and see how they're doing things like post metadata using yaml. It's definitely not something to replace the existing static blog generator they have, but it's a cool project for just tinkering with things like the github API.
IF you want it to be a truly usable project, I'd say you need to make it themable and not depend on parsing the file name for the post titles.
Looks like you just need to fork the repo they've created or have a repo called 'gitpapers-blog' and login with github, and the posts will show up.
Looks like it was just a fun learning project for them.
I'd say it'd be helpful to add to the documentation that you have to login to gitpapers after forking or creating the repo in the explanation for clarities sake.
Yeoman is fantastic! I actually used it to scaffold out my blog, which I use jekyll for. It's amazing the things that we can automate things we used to have to manually do and focus on making cool stuff!
IF you want it to be a truly usable project, I'd say you need to make it themable and not depend on parsing the file name for the post titles.