Metacat

Resampled the background image for the admin docs for a faster page load

prep for 2.3.1 release

point users to the geoserver admin page deployed in the separate geoserver webapp (thanks, TFRI!)

use https for fonts.googleapis.com imports so they can load in https deployments.

include perl DateTime module in registry install instructions. https://projects.ecoinformatics.org/ecoinfo/issues/6099

Adding theme configuration screenshot to docs

use 2.3.0 for this next release of metacat.

correct rst formatting.

make sure all versions are using 2.2.2 of some sort -- thinking of making this release a 2.3.0 release because we will be branching/tagging from the trunk, not the 2.2.x branch.

Added Lauren to contributors list in the metacat guide, and made the two lists match in sort order.