ls4 services implementation to historical template

update historical template to utilize new ls4 index services. ideas to be tested and attempt to be implemented...

interactive index download map

[x] boundaries, symbolize like data download map. on hover, show image/raster for that sheet? only see 1 sheet of imagery at a time
[x] county boundary layer on in background for reference. toggle on/off?
[x] county coverage component goes bye-bye if index download map present
[x] click to popup like data download map. include sheet #, download links (x3), WMS service link, county name associated with sheet
[x] scanned indexes list download component (sidebar) goes bye-bye if index download map present (reduce duplication). keep the WMS copy button
[x] no labels in map
[x] move WMS link copy button component up, under metadata but above the About chunk.
[x] investigate the current wms service copy link component to see if it is using or should be using these new historical service links... then act accordingly

when completed, announce changes and efforts to make this happen to TNRIS. article on tnris.org? nominate RDC for admin leave for all their hard work

TNRIS / dataHub