Documenting new guided setup for rollback pipeline

* Drafting new content

* Updating screenshots and tweaking content

* Update screenshot

* Adding new steps and updating screenshots

* Fixing lint errors

* Fixing validation error

* Implementing review suggestions

* give options for setting up deploy markers and clarify workflow rollback

* Lint: missing space

* Validate: fixing xref

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Co-authored-by: Rosie Yohannan <rosie@circleci.com>

Author: yaningo