[user feedback] remove timber from geojson example

[danswick]

Per some user feedback we received via the docs site, we should consider removing timber from this geojson example. It doesn't really serve the example and might be confusing to users who aren't familiar with it.

[langsmith]

@danswick , do you think I should just go ahead and remove all Timber usage from the app entirely? Seems that the reason for removing it from the one example could be said about all of the examples that currently use it, no?

[danswick]

@langsmith I don't think I've seen any other feedback about timber, so I would say that you should leave it in if it's valuable to the app.