Revert "JBDS-3034: Add Tern to JBDS target platform"

This reverts commit dfcc46c7c3788bf0981902b971454a477dc99fbf.
add notes about Sapphire (Arquillian req) and Tern (jst.jsdt and AngularJS req) (JBIDE-17318, JBDS-3055)
JBIDE-17519 link to script verifyTarget.sh; migrate from md to adoc
JBIDE-17519 move details about building and updating TPs to https://github.com/jbosstools/jbosstools-devdoc/blob/master/building/target_platforms/target_platforms_updates.adoc and link to it from here
JBIDE-17603: Luna RC4