[s2s-wip] ray instructions
<!-- This line specifies which issue to close after the pull request is merged. -->
Fixes #7170 

### TODO
- test
- finish instructions
- modify ray_tune_cli to not hardcode all possible lightning args.
- probably more things

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
