(docs) ansible delete command relies on specific logic to work

[mieel]

The stackl delete for ansible invocations plays the role with -e state=absent

this implies that, for the deletion of the role/playbook to have any effect, it should be developed with tasks containing:
state: "{{ state }}"

This should be mentioned in the docs

[stgrace]

Not sure how we could fix this issue.
Potentially we could add a field to an ansible functional requirement that defines what state should be added when executing a delete.

[mieel]

I think it's better to make the delete ansible command optional, especially when it's combined with a terraform invocation.