If I may, the goal seems a bit incorrectly specified for hypermedia. For instance, if github decided to change the number of results they return per page, then

If I may, the goal seems a bit incorrectly specified for hypermedia. For instance, if github decided to change the number of results they return per page, then your script would not break, but it would have a different meaning. I would suggest a better goal to be "get the 11th public gist". Although that still isn't perfect since it doesn't mention how the collection would be sorted (I presume by date).