Merge pull request #10 from mekhanikov/develop

Bug #24411
merge Jeremy's pull request
add "param=dpla_prod" to zoomit calls to update service cache
Merge pull request #11 from mekhanikov/develop

Bug #24154: mini-thumbnail for exhibit homepage
Updated footer nav
Removed Help link from main nav
Fixed social links
Fixed Parnters link
Merge remote-tracking branch 'upstream/develop' into develop