Make the heatmap prettier.

[mbjackson-capp]

• Up the tolerance on heatmap_data_prep simplify_geojson to .00001. It'll look like this:

Instead of this:

Just generally smoother, and runtime will barely be affected.

This will change the three .geojson files in static.

Note also that when I tried to run heatmap_data_prep.py it told me (even in the right environment) that I was missing the python library pyogrio. We should install that in the official poetry for the project.

• Dynamically adjust the outline width on each census tract so it's smaller with zoomout. Right now we don't do this and the gray dominates as you get further out:

This should be doable in Leaflet (I have something very similar enabled to dynamically resize the route widths on zoom in the other map)