[mod] utils/morty.sh - check a morty installation

Impplement a script to check a morty installation::

   ./utils/morty.sh install check

Related-to: https://github.com/searxng/searxng/issues/450
Related-to: https://github.com/searxng/searxng/pull/446#issuecomment-954599668



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>