Upgrade read the docs to support 3d interactive models

[shimwell]

CadQuery has really nice interactive 3d objects that can be rotated in the browser. Super nice and useful for users to explore the shapes and also could remove the need for a screen shot of the 3d shape (which is a manual operation at the moment)

example of 3d interactive shape in cq docs https://cadquery.readthedocs.io/en/latest/examples.html#simple-rectangular-plate

package for adding this read the docs https://github.com/Peque/sphinxcadquery