Sorry, but I don't think they're giving you free icons to use for your website.
The article says Octicons are "a custom icon font for use on GitHub.com and GitHub products". In their companion Making Of post, they answer a question about licensing [1] by saying "The font is for GitHub use only." [2].
The article says Octicons are "a custom icon font for use on GitHub.com and GitHub products". In their companion Making Of post, they answer a question about licensing [1] by saying "The font is for GitHub use only." [2].
[1]: https://github.com/blog/1135-the-making-of-octicons#comment-...
[2]: https://github.com/blog/1135-the-making-of-octicons#comment-...