The URLs do not seem entirely stable for the wikimedia images. I thought they would be. So we need to make local copies of the remaining ones:
$ grep -r wikimedia *.rst
angular.rst: src="https://upload.wikimedia.org/wikipedia/commons/b/be/Dzhanibekov_effect.ogv"
configuration.rst:.. figure:: https://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/MtbFrameGeometry_FSR.png/330px-MtbFrameGeometry_FSR.png
configuration.rst:.. figure:: https://upload.wikimedia.org/wikipedia/commons/c/ca/Grashof_Type_I_Four-Bar_Kinematic_Inversions.gif
configuration.rst: .. figure:: https://upload.wikimedia.org/wikipedia/commons/9/9e/Watts_Linkage.gif
motion.rst:.. figure:: https://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Snakeboard_down.jpg/960px-Snakeboard_down.jpg
visualization.rst: https://upload.wikimedia.org/wikipedia/commons/e/e3/Suzanne.stl
visualization.rst: https://commons.wikimedia.org/wiki/File:Suzanne.stl
The URLs do not seem entirely stable for the wikimedia images. I thought they would be. So we need to make local copies of the remaining ones: