Include diazo documentation in Classic backend documentation

[erral]

Links of affected pages in Plone Documentation, if any.

No response

Description

There is this documentation, which I don't know who serves and mantains https://docs.diazo.org/en/latest/ and I think it should belong (also) to the Plone documentation.

I see that the docs folder in the diazo repository are the same as in diazo.org, so I think we should integrate them pretty similar to the way we do with restapi.

[stevepiercy]

The repo is at https://github.com/plone/diazo.

What are the criteria needed to complete and close this issue?

• Find the maintainers of the RTD project at https://app.readthedocs.org/projects/diazo/ and request an invitation to become a maintainer.
• Convert the docs to MyST format.
• Decide where to bring them in as a git submodule.
• Set up the submodule in plone/documentation following https://6.docs.plone.org/contributing/documentation/admins.html#importing-external-docs-with-submodules
• Other?

[erral]

We have some dragons here :)

[erral]

Checking on readthedocs, it looks like the maintainer is @lrowe ping!

[Manik-Khajuria-5]

@stevepiercy @erral Interested to work on this issue . Any suggestion what not to do ?