Add cleanup script for refreshing laradock

cleanup.sh

+#!/usr/bin/env sh
+
+#####  WARNING !!!  ###########################
+# YOU HAVE ALREADY KNOW WHAT YOU'RE DOING !   #
+# ------------------------------------------- #
+# This will remove all your saved environment #
+# without mercy !                             #
+# ------------------------------------------- #
+
+sudo rm -rf cache
+sudo rm -rf data
+sudo rm -rf session
+
+git checkout cache
+git checkout data
+git checkout session
\ No newline at end of file