choropleth maps for sampling and prevalence-global

[mkoo]

This may be just the thing: https://github.com/sgratzl/chartjs-chart-geo
Highly requested feature that should be prominent on the dashboard. Let's discuss.

[mkoo]

@birbjam points out that the above depends on node NPN but can try a choropleth map based on D3

[birbjam]

https://www.d3-graph-gallery.com/graph/choropleth_basic.html

Possibly use this D3 map for samples per country.

[mkoo]

Also discussed: start with a simple choropleth for Bd/Bsal samples per country and per US state on main Dashboard page (hover view should show tallies for each), then next priority maps would be: 1) bd samples 2) bsal samples (hover over shows tallies for neg/positive)