add discover link to basemap imagery
add discover link to basemap imagery

agrc/gis.utah.gov,agrc/agrc.github.io,agrc/gis.utah.gov,agrc/gis.utah.gov,agrc/gis.utah.gov,agrc/agrc.github.io,agrc/gis.utah.gov,agrc/agrc.github.io,agrc/agrc.github.io,agrc/agrc.github.io