Mrge from 2.5 branch: Clean up the admin and doc page styles, update all the screenshot images, and include a link to the MetacatUI Github
add section for CN vs MN endpoints for MetacatUI. https://projects.ecoinformatics.org/ecoinfo/issues/6532
update documentation to reference Tomcat 7, Java 7 and newer apache config file name conventions. https://projects.ecoinformatics.org/ecoinfo/issues/6855
Added an explanation of "metacat context" to the Metacat Themes docs based on questions asked by an actual user following our instructions in the docs.
Edited the docs to incude more details about creating a custom theme
minor edits to the UI theme section. https://projects.ecoinformatics.org/ecoinfo/issues/6067
Added the documentation for the new MetacatUI theming mechanism. Make some styling changes to the documentation and configuration pages and added Bootstrap and FontAwesome.