tutorial update: faceting, highlighting, etc

The tutorial hasn't really been changed since we entered the incubator. Highlighting and Faceting might be nice additions.

Looking back, I wish I had chosen a different data set like books or movies (or a mix of both)... something that wouldn't get out of date as fast as electronics, and that more people could identify with. The biggest downside is examples in the Wiki refer to the current example docs.

breaking into multiple pages, and a screenshot or two wouldn't be bad idea either.