Model with pages + track based sessions is missing other explores, doesn't work well with dashboards

[emmmbrown]

The tracks.model.lkml, built for the tracks-only based sessionization option, has a few more explores that are missing from pages.model.lkml. I managed to copy the explores from tracks to get them to work, but consider adding them to this repo to make the two sessionizations have equal resources.

The dashboards also are only built for the tracks model, and need to be edited to work for pages.