Issue tutorial Ray-traced forest on https://virtualplantlab.com/

There is a problem in visualizing /raytracedforest.md on the VPL website (https://virtualplantlab.com/stable/tutorials/from_tree_forest/raytracedforest/)

The problem is not visible on the github page (https://virtualplantlab.com/stable/tutorials/from_tree_forest/raytracedforest/)