Add documentation for the ORE model expansion for derived data
Added the documentation for the new MetacatUI theming mechanism. Make some styling changes to the documentation and configuration pages and added Bootstrap and FontAwesome.
FontAwesome and Bootstrap are imported locally rather than via CDN. Updated the docs screenshots to the new style.
Added a Sphinx theme for the documentation that mirrors the new default theme for MetacatUI.
https://projects.ecoinformatics.org/ecoinfo/issues/6075
Moving Metacat Sphinx RST documentation from docs/dev to docs/user directory.
Adding new documentation section for Metacat design documents in Sphinx/ReStructured Text format. Build this documentation using theprovided Makefile, assuming that both Sphinx and PlantUML are installed and on the local executable path by running 'make plantuml html'....