Update documentation and security keys in blog
Update documentation and security keys in blog

- This blog should show best practices of security and usage of
  authboss. By using terrible documentation and terrible keys we were
  setting a bad example for users of authboss. This has been corrected.
- Fix #1

wangyu0305/authboss-sample,orian/authboss-sample,go-authboss/authboss-sample