text: Title: [Proposal] Add Tutorials for MuJoCo based environments (contributors welcome)
  Body: ### 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: 
  - [x] 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](https://github.com/google-deepmind/mujoco_menagerie/blob/main/google_barkour_v0/README.md) (which will have custom reward, obs?, terminal?)
  - [ ] Using robot model with custom simulation options
  - [ ] Create a Custom MuJoCo based environment class  by subclassing `MujocoEnv` 
  - [ ] ??? Transfer learning across different models ???
  - [ ] Transfer learning with [MuJoCo MPC](https://github.com/google-deepmind/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
  
  _No response_
  
  ### Pitch
  
  _No response_
  
  ### Alternatives
  
  _No response_
  
  ### Additional context
  
  _No response_
  
  ### Checklist
  
  - [X] I have checked that there is no similar [issue](https://github.com/Farama-Foundation/Gymnasium/issues) in the repo
  