some suggestions for the v0.2.0 release

[ChristophKin]

• in the last line of the run_sim.sh file the robot name should be --robot go2, I suppose?
• the config file for the Unitree L1 LiDAR must be in the path IsaacLab-0.3.1/source/data/sensors/lidar/Unitree_L1.json or in IsaacLab-0.3.1/source/exts/omni.isaac.sensor/data/lidar_configs/Unitree_L1.json and not in IsaacLab-0.3.1/source/data/sensors/lidar/Unitree/Unitree_L1.json
• the material files (AsphaltStandard.json, AsphaltWeathered.json, ...) must be copied to the IsaacLab-0.3.1/source/data/material_files folder. Otherwise there are lots of failed to load Material File errors (I don't know if this is only a problem with my setup?)

[abizovnuralem]

@ChristophKin Thanks for your work! If it is okay, can you make a PR with these comments, please? I will be happy to approve it