Enable tracking of search via google analytics

[crhistianramirez]

What

@jdalt was kind enough to reference this resource which was helpful in figuring this out. In that document is a library called autotrack that enables this kind of stuff for you automagically.

For now I'm just adding the urlChangeTracker plugin but we can pretty easily add any other other plugins we want if we think they're applicable.

Why

Lets us make more informed decisions on what features to build next.

Ensure the following interactions work as expected. Please test using a mobile form factor.

• [x] Tapping on a marker on the map displays information about the marker in a popup.
• [x] Tapping the "Show list of locations" button replaces the map view with a list view.
• [x] Tapping an item in the list replaces the list view with a map view, and navigates the map to the tapped item on the map.
• [x] Tapping one of the ✅'s in the legend filters items on the map and in the list.
• [x] Changing the language to spanish changes things on the page.
• [x] Clicking the Help/Info button opens and closes a menu with information.
• [x] Clicking the X Close button on the Help/Info screen closes the modal.

Check the app in the following web browsers:

• [x] Chrome
• [x] Firefox
• [x] Edge
• [x] Safari

[jdalt]

@crhistianramirez I ended up merging #167 which had similar changes in regards to Analytics. I think the way search is tracked in that PR is as an Event whereas it is done as a Page View in this one. If the Page View is a much better option then I'd ask that you make the case and consider updating this PR or opening another.

I also like the clean up you did with DomPurify. If you could merge master back into this PR or open a new one to get those changes I'd gladly merge it.