Remove blogpost from the resources links

The main project page points to http://www.phase2technology.com/blog/using-state-machine-with-state-flow... which doesn't exist anymore.
It seems to be a D7 resource from 2012, so not sure if it's worth keeping, in case it is, found an archived version of it in https://drupalsun.com/john-robert-wilson/2012/05/30/using-state-machine-...