Document our Leaflet examples

[jeancochrane]

Documentation request

I feel ambivalent about Leaflet and would someday like to evaluate alternatives. In the meantime, the reality is that we use it a lot but we don't have good internal documentation for how to use it.

In the past, our de facto pattern has been to provide examples of existing DataMade projects that have implemented common Leaflet patterns, and then encouraged new developers to copy and tweak the code. For an API as complex as Leaflet I think this isn't actually a bad approach, we just need to codify it somewhere.

Some existing pointers that I've found to be useful in the past:

• Leaflet's choropleth tutorial (see the live site)
• React-Leaflet examples page
• LISC CNDA map component

[smcalilly]

I spent some investment time learning how to use Leaflet. Here are some artifacts.

[hancush]

Sam has drafted some notes, will draft this documentation after hands on experience with React Leaflet in StormStore Phase 2.2

[hancush]

Superseded by #184.