Moving Metacat Sphinx RST documentation from docs/dev to docs/user directory.
Updating Sphinx doc structure in prep for moving metacat admin guide to Sphinx.
Additional layout and styles for metacat documentation.
Fixed typos in metacat documentation.
Removed version as not sure when this will be delivered, so be agnostic.
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'....