Three improvements to vizes

[dwaipayanbanerjee]

1. Experiment with using a discrete (5) legend for the map. Feel free to set a cutoff after which it doesn't apply (i.e. at 10-25%), making the important part of the viz, within the 10% range, clearer.
   https://observablehq.com/@d3/color-schemes

2. If it's not too difficult, implement a bubble chart for the finance data, like in the tableau. @akshaya-seetharam
   https://observablehq.com/@d3/bubble-chart/2?intent=fork (donor)
   https://observablehq.com/@d3/zoomable-circle-packing?intent=fork (party, donor)

3. Similarly, a bar-chart race for the campaign finance, incorporating the yearly increase in each party's funds.
   https://observablehq.com/@d3/bar-chart-race?intent=fork

This is not a priority as of now. To keep in mind after we've gotten a handle on the new Lokniti data.