Custom domain name is required?

[stefanpejcic]

Describe the bug
Should state in readme that you need a custom domain for this to work! Forked last night and on https://stefanpejcic.github.io/fettle it runned no actions, plus css was broken. As soon as I added a custom domain, everything Is same as in demo.

[coolacid]

Just need to edit assetPrefix in next.config.js to be blank.

ie;

  assetPrefix: '',