Attribution is a fine line; removing the attribution from where it was in the template and plastering "All Rights Reserved" copyright over it is a very clear violation of the creative commons license.

In some situations, it's difficult to place attribution along with the media, but in this case, it's not - it's a webpage - and having the attribution be in the source code is not really acceptable, because it's not reasonably accessible for someone looking for it.

If you look at that page and only that page, what leads you to believe that this is built of off a CC-BY work? Nothing. Sure, you can add "for copyright and license information, visit this link" in the footer, with a link to the github readme page that has the attribution, but removing it all together and only leaving scraps of it in the source code is just careless, reckless misuse of the original author's work.