Do not remove `500.html` file since it is used by nxginx
Do not remove `500.html` file since it is used by nxginx

in case of critical problems when application cannot respond

openfoodfoundation/openfoodnetwork,mkllnk/openfoodnetwork,mkllnk/openfoodnetwork,openfoodfoundation/openfoodnetwork,openfoodfoundation/openfoodnetwork,mkllnk/openfoodnetwork,mkllnk/openfoodnetwork,openfoodfoundation/openfoodnetwork