Move to separate cmd

examples/lunar_lander.py

@@ -3,6 +3,7 @@
 Install the following dependencies before running this example -- swig must be
 installed before box2d can be installed, hence it is a separate command:
     pip install swig
+    pip install gymnasium[box2d]==0.29.1
     pip install ribs[visualize] tqdm fire gymnasium[box2d]==0.29.1 moviepy>=1.0.0 dask>=2.0.0 distributed>=2.0.0 bokeh>=2.0.0
 
 This script uses the same setup as the tutorial, but it also uses Dask instead