Remove useless grav_cron file

grav_cron

@@ -1,19 +0,0 @@
-#!/bin/sh
-
-GRAV_ROOT="/var/www/grav"
-GRAV_UPDATE_LOG="${GRAV_ROOT}/logs/update"
-
-# Need to work in the Grav root directory
-cd "${GRAV_ROOT}" || exit 1
-
-# Display the Grav's version and check if an update is available
-GRAV_UPDATE=$("${GRAV_ROOT}"/bin/gpm version|grep upgradable)
-
-# Verify if the variable contains something
-if [ -z "${GRAV_UPDATE}" ]; then
-  rm -f "${GRAV_UPDATE_LOG}"
-else
-  touch "${GRAV_UPDATE_LOG}"
-fi
-
-exit 0