Annotate low cost optics assembly render

Apply suggestions for clarifying the low-cost optics assembly from #432 (closed).

becomes

There are extra construction lines and words, and the view is rotated. In the small displayed versions of the images you cannot see that the nut slot and mounting screw hole are now visible. Look at the deployed view app.

This does not make any changes to the physical part which might also help. That is left as a discussion #438, for after v7.0.0

closes: #432 (closed)