Merge branch 'cleanup/handbook' into 'master'
Cleanup/handbook3.3
See merge request !2315 (merged)
(cherry picked from commit 147c17f4)
da7c3d86 [doc][handbook] change references from 3.2 to 3.3, replace broken links and update dune versions 09d74723 Merge branch 'master' of... 060d8e9f [doc][handbook] replaced the dumux version 3.3 occurances with a DumuxVersion command. 4b30139e [doc][handbook] removed some comments.