4.0 Beta 3 launch

- add some more docs as well as version bump
- changelog(!)
3 jobs for 4.0-beta3 in 2 minutes and 8 seconds
latest
Status Name Job ID Coverage
  Build
passed build #4098

00:01:22

 
  Deploy
passed pages #4099

00:00:45

passed pages:deploy

00:00:00