Update front page facet search buttons and linked browse URLs

[srappel]

The front page facet search buttons should be updated so the labels, destinations, and presentation better reflect the browse paths we actually want to promote.

Brainstorming:

• Sanborn Maps -> /catalog?f[dct_publisher_sm][]=Sanborn Map Company
• Aerial Photos -> /catalog?f[gbl_resourceType_sm][]=Aerial photographs
• Index Maps -> /catalog?f[gbl_resourceType_sm][]=Index maps
• Raster Data -> /catalog?f[gbl_resourceType_sm][]=Raster data
• Wisconsin Open Datasets -> /catalog?f[dct_spatial_sm][]=Wisconsin&f[gbl_resourceClass_sm][]=Datasets
• Harvested Open Data -> /catalog?f[dct_source_sm][]=University of Wisconsin-Madison&f[gbl_resourceClass_sm][]=Datasets
• Milwaukee -> /catalog?f[dct_spatial_sm][]=Milwaukee
• Public Data -> /catalog?f[dct_accessRights_s][]=Public
• Restricted Data -> /catalog?f[dct_accessRights_s][]=Restricted