Update ci to adapt to changes in nightly and removal of Future v5. Also make formatting a failure in master.

Redirect default web page to master and remove Futurev5 version in CI and replace Futurev5 in documentation with master.

Note that v60r0 documentation will still refer to Futurev5 and will require a retag to fix it. As that is a technical release and we should likely remove it from the documentation once v60r1 is released, I choose to ignore this.

cc: @mimazure, @admorris, @clemenci