updated image names, fixed HPIDS link
add a macro for validating links on build
add link validation to partials and macros
fix crossref links to 'index'
cln: remove unused programs.html template
audit/clean up links in remaining templates
Data Catalog almost complete, still some inconsistencies
rename data-and-mapping-solutions page
clean up links in markdown content
fix "Read More" link in around-the-state
Merge branch 'link-audit'

Conflicts:
	content/markdown/news/2014-08-27-new-smith-county-imagery-available.md
Merge branch 'catalogImages'

Conflicts:
	templates/data-catalog-entry.html
	templates/index.html
	templates/maps-and-data.html
	templates/partials/mainfeature.html
	templates/partials/navbar.html
	templates/spotlight.html
	templates/wms.html
rename hpids page
fix contact link for RDC page
update alt tag for CIAP historical imagery article