Slightly off topic, but the url seems to be conflict with a user called "certifications". You can find that user using GitHub api or Mobile app, but you can't view his profile page on desktop.
It highlights that while vanity / "root" paths are cool, they also become a challenge later on.
They could either have gone with e.g. Reddit's scheme of having users under `/u/certifications`, or put extra GH pages under a subdomain (e.g. certification.github.com or pages.github.com/certification)
Came to say this, and also that the app user link hijacks the page link on iOS. I had to click the ellipsis, then share, them open in safari to even access the page...
They could either have gone with e.g. Reddit's scheme of having users under `/u/certifications`, or put extra GH pages under a subdomain (e.g. certification.github.com or pages.github.com/certification)