This change makes the user guide page more readable and results in a command line usage page which is easy to navigate as all sub-commands can be found in the left-hand outline panel. Also fix the layout of the environment variables table by using a replacement. Signed-off-by: Paul Barker <pbarker@konsulko.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>