That's why it's "the hard way"

Open the README.md file directly. Links will work then.

https://github.com/kelseyhightower/kubernetes-the-hard-way/b...

Apparently, there's something odd in the GitHub support for relative links in the main project README.md.

Thanks for mentioning this. It looks like there is something wrong on GitHub's end. The current, temporary, workaround is to visit the README directly and the relative links should work.

I was able to contact GitHub support and reported the issue. Looks like relative links from the main page are working again. Thanks for the heads up.