Revert "change production_url to ngnis.me"

This reverts commit 3e5f91b1235656079744fa41e134a54e4fa9ddbb.
Revert "add CNAME, I would to use myself domain, ngnis.me"

This reverts commit e8e7df281de341d9b608736caffeb5603ad4ccc7.
tangyi.github.com => tangyi.github.io