[Proposal] Add Tutorials for MuJoCo based environments (contributors welcome)

Proposal

With the release of the MuJoCo-v5 environments, in Gymnasium 1.0.0 (which will be coming out, prior to the heat death of the universe).

We need tutorials on:

• loading a quadruped custom robot model (WIP https://github.com/Farama-Foundation/Gymnasium/pull/838)
• loading a bipedal / humanoid custom robot model
• loading a custom scene e.g. G-Barkour (which will have custom reward, obs?, terminal?)
• Using robot model with custom simulation options, and an analysis of the changed behaviour
• Create a Custom MuJoCo based environment class by subclassing MujocoEnv
• ??? Transfer learning across different models ???
• Transfer learning with MuJoCo MPC
• more tutorials ???

Contributors are welcome, with experience running RL on robotic environments, or with knowledge of the MuJoCo simulator, or with knowledge of Robotics, or just willingness to learn. Comment here or discuss or join the gymnasium discord (invite link on the README) and ping me in the # New Contributors channel.

Motivation

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Pitch

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Alternatives

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Additional context

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Checklist

• I have checked that there is no similar issue in the repo