Updated readme.md
Updated readme.md

Removed the management portal HOL item. Removed preview word from the the HOL title for "Working with new preview portal".
opsgility/DevCamp,Azure-Readiness/DevCamp,SvenAelterman/DevCamp,opsgility/DevCamp,opsgility/DevCamp,SvenAelterman/DevCamp,Azure-Readiness/DevCamp,SvenAelterman/DevCamp,Azure-Readiness/DevCamp