docs(guides/developer): Add GitHub keygen step to AWS setup (#1917)
docs(guides/developer): Add GitHub keygen step to AWS setup (#1917)

Co-authored-by: Dave Dorbin <3a983b921291999521a653180c5b82ccd2c36700@google.com>
spinnaker/spinnaker.github.io,spinnaker/spinnaker.github.io,spinnaker/spinnaker.github.io