Updates for example deployment

[rothgar]

Description of changes:

Major differences I made throughout the doc

• Use semantic line breaks
• By default assume someone creates a new cluster with 1.20
• Add commands to tag subnets as needed
• Add line breaks to long commands
• Use --query with aws cli instead of relying on jq where possible
• Add helm repo update
• Fix label match for karpenter pod
• Add cluster delete command to cleanup

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[njtran]

Great improvements to the doc! Thanks! Just a couple of questions and checks.

[ellistarn]

One more time, with feeling!