install docs: catalog SEMVER globally for version resolution
Installing-on-UniData: catalog MVPKG.SEARCH (udt search now supported)
Installing-on-UniData: note the https registry requirement + MVPKG_INSECURE opt-out
Installing-on-UniData: catalog the decomposed MVPKG (cmd-framework) client + mvpkg init
UniData install: document MVPKG remove
UniData install: document MVPKG update
UniData install: document MVPKG list
UniData install: document MVPKG register for standalone installs
Add: Installing MVPKG on Rocket UniData (bootstrap client + first install)