openbox: increase top margin to 30px

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
xmobar: add initial config

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
tint2: don't display clock

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>