Broken link of GitHub Certification Handbook

[barla-x88]

Expected Behavior - Clicking the link should take the user to the Github Certification Handbook page.
Actual Behavior - The user sees content unavailable message.

[andrijeski]

Also the FAQ link is broken, so both these in readme aren't working:

• GitHub Certification Handbook - https://examregistration.github.com/handbook
• GitHub Certification FAQ - https://learn.github.com/faq