[isaack]

You need to turn off CloudFlare proxying for your domain. Instructions here: [1]. (Can't find an official help page, sorry).

Also make sure that you are using a CNAME record pointing to `YOUR-USERNAME.github.io.`.

[1]: https://webmasters.stackexchange.com/a/71922

[2]: https://help.github.com/articles/setting-up-a-www-subdomain/