doc: Add video link for Molex crimping
doc: Add video link for Molex crimping

Molex crimping isn't hard per se, but walking through the process makes
everything a bit more clear.  While the photos in the repo were a
wonderful start, this added a bit more context which was very helpful.

thatch/makerspace-auth,thatch/makerspace-auth,google/makerspace-auth,google/makerspace-auth