Add analytics tracking code

[techieshark]

Analytics should track at least:

• screen views
• do visitors scroll to bottom of stories
• individual story passes & saves/likes
• device used
• geo metrics
• session length
• time spent on discover mode v map mode
• session interval
• most visited page
• top search(es)

Other things to think about:

• interactions with more info & directions buttons
• interactions with photos (taps on photo)

[techieshark]

Fixed by 758dc17

Any specific analytics setup will have to wait until we hear more about what is going to be tested, and currently it sounds like the testing will just be qualitative.

[jessemoreburritos]

Hello there

I've added a tracking tag for mixpanel but get no love firing it in/with localhost (or whatever you kids call it these days. In my day a milkshake, ferry to manly, a ticket to the pictures and a bag of lollies were 20c!)

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