Track additional events

The goal is to eventually add tracking for the following actions:

* Click the "help" button at the top of the page
* Hover over the "more info" icons

This is an early review so that I can get early directional feedback before investing too heavily in a particular approach.
Some semicolons are needed on lines 28 & 29.  If you use pycharm, there's a jshint setting that will provide some automatic warnings.  It hounds me too.  :)