This is a great guide. I followed the similar steps for https://gitignore.io
I was doing a lot of development work and going to github.com/github/gitignore to copy templates from GitHub's website to my own file system was getting tedious. What I wanted was a simple command line tool like
gi java > .gitignore
So I built it over the course of a week while at Mammoth CA. I was on a snowboard trip so I would ride during the day and code at night. I was thankful to have a great designer (who worked at GitHub) help me design the site. And today the project is almost 5 years old and gets nearly 80,000 MAU's.