Update tutorial Docker image names and documentation

[sea-bass]

Description

This PR updates the Docker images used in the tutorials to the new moveit Docker Hub organization.

It also updates docs associated with this change, plus how to build documentation locally with virtual environments (needed for Ubuntu 24.04, introduced in #916)

I also tested all the combinations for Humble, Jazzy, and Rolling, and the demo.launch.py actually work in all 3 cases! Magical.

Closes https://github.com/moveit/moveit2_tutorials/issues/918 Closes https://github.com/moveit/moveit2_tutorials/issues/936

Checklist

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