EDU-1955: Rewrites introduction and overview

EDU-1955: Adds getting started

EDU-1955: Adds supported platforms

EDU-1955: Removes install section

EDU-1955: Removes update/migrate section

EDU-1955: Removes usage section

EDU-1955: Removes resources section

EDU-1955: Removes requirements section

EDU-1955: Adds releases section

EDU-1955: Adds contribute section

EDU-1955: Condenses Support section

EDU-1955: Adds header image and licence shield

EDU-1955: Adds usage examples

Author: franrob-projects