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.
Good question!  This is following the same pattern that we've established (e.g. `edx.bi.csv.downloaded`).  When the event is sent to segment, we also send some additional information, such as page name.  There's a bit of [documentaiton](https://edx-wiki.atlassian.net/wiki/display/AN/Segment.io+Events) around events too if that's helpful.

Currently, the event gets log in a analytics dashboard specific segment project.  If you haven't already, it might be worth it to confirm that this event is as desired.