Read the Docs moved hosting to readthedocs.io instead of
readthedocs.org. Fix all links in the project.
For additional details, see:
https://blog.readthedocs.com/securing-subdomains/
> Starting today, Read the Docs will start hosting projects from
> subdomains on the domain readthedocs.io, instead of on
> readthedocs.org. This change addresses some security concerns around
> site cookies while hosting user generated data on the same domain as
> our dashboard.
Trying to preserve the meaning of the examples. Not all occurrences in
`docsite/rst/playbooks_lookups.rst` have been changed for instance to
allow the unchanged examples to be used for testing.
Related to: #17479
