Create documentation for manually destroying resources in AWS

[tylerpotts]

Document how to destroy resources after looking them up by tag in AWS

[tylerpotts]

Somewhat related to #579

[tylerpotts]

Basic steps:

• delete EFS
• delete nodegroups
• delete eks cluster
• delete security group

[rsignell-usgs]

Yes, these basic steps worked for me!

[brl0]

@iameskild, You've been through this a couple of times recently, it would be good to add anything else that you think should be checked to this issue.

[tylerpotts]

Converting to a discussion for future posterity