Remove state

* When user removes a state from location selection form, that location set (state, county, MSA, etc) will be removed from the DOM
* When removed from the DOM, queries are updated, and a "max number" counter is decremented
* When new location sets are added, counters are incremented. Set Number counter never decremented to ensure unique location set number IDs and appropriate queries / selectors
* Fonts for H3 in the Explore form updated to Avenir Next Demi