New version of CA counties

[tiffanychu90]

• Add cut-offs for tiers onto case charts
• Calculate, based on the case rates per 100k set by CA DPH, where that cut-off is, label it, but still plot new cases for each county

[tiffanychu90]

• Added hyperlinks to jump down to the relevant county.
• Might need to add "return to top" hyperlinks.
• Automated in Civis for daily updates

Close via #40, #41, #42