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.
Consider moving this to the `trackingProperties` field in line 12.  It would set a default value like you've implemented, but enable it to be overridden too.