fix spelling typos in comments
  expanded comments and re-arranged the variables in the 'Important Variables' section
clarified that the path for the SSH file is on the local machine
Added details to clarify and flesh-out the steps.  Standardized the organization for each playbook (steps needed beforehand, etc.)
Merge pull request #6 from weedySeaDragon/14801-readme-rewrite

Flesh out the Readme, add comments to example-vars.yml, fix 2 minor types