Potential rewrite/addition to the EKS setup page

Amazon has now released a eksctl command line tool (yay!) that lets customers create a cluster in one command rather than go through the old guide with tons of steps (also a good example of not writing out a step-by-step guide/repeat the Amazon guide in our documentations).

May be worth just mentioning this in the guide/ marking this as the recommended method. Any of the steps that supplement the old method can be either removed or left as a second option for customers if they wish to do it the slower way.