Track feature usage

[jloh02]

NUSMods is experiencing a feature creep. We should better monitor this. Thoughts off the top of my head

1. Should TA mode be enabled by default? Or hidden?
2. Export time duration monitoring to determine if we should timeout
3. Optimiser usage once we move it into a primary screen

Possible solution:
Use matomo to track specific user interactions e.g. pressing of the TA-mode button

[yangshun]

Re: TA mode — Good idea, probably hidden and enabled via settings. Maybe a one-time notification to let people know about the feature. The button icon is also not very intuitive, I relied on the tooltip to know what it does.