clean pip cache, apt cache

mx-linux/clean.sh

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+# clean live installation before backup
+sudo apt-get autoclean
+sudo apt-get clean
+pip cache purge
+rm -R ~/.cache/pipenv
+rm /var/log/syslog
+rm /var/log/kern.log
+rm /var/log/auth.log
+rm /var/log/ufw.log
+rm /var/log/last.log
+rm /var/log/boot.log
+rm /var/log/vbox*
+rm /var/log/casper.log
+rm /var/log/dpkg.log
+rm /var/log/*live*
+rm /var/spool/cups/*