Use multi-column layout and correct header colour

Also fixed some tab indents

Change-Id: If2e4301d2199e0a72c8d859231430c1982fd0fc0
Reviewed-on: https://gerrit.libreoffice.org/11649
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>