FC-0068 docs: diataxis criteria documentation

[Apgomeznext]

This PR adds the diataxis criteria documentation approved.

Google doc: https://docs.google.com/document/d/1mHnd2mJTy-IAgGxE0sP6AO0_oNogQbXhEQNZtzigLww/edit?tab=t.0#heading=h.lpo0vmwalr3v

Rendered page: https://docsopenedxorg--612.org.readthedocs.build/en/612/documentors/concepts/content_types.html

[openedx-webhooks]

Thanks for the pull request, @Apgomeznext!

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[sarina]

I edited your pull request description with a link to the Google doc as well as to the rendered page, which is helpful for both reviewers and anyone who comes across this PR at a later time.