State Trend Map for v2.5

[johnhryhorchuk]

For Version 2.5 (the narrative to quickly follow 2.0), we should add a state map that has a time-elapse function (click play or drag a slider at the bottom) and shows case per 100,000 trends for every county over the past 2 months (using daily intervals of the 7-day rolling average for daily new cases). What I'm thinking, basically, is an interactive version of this, but using 7-day averages rather than weekly data:

It would need to be structured to automatically update daily.