Fix mv/ln instructions for cookbook hacking
Fix mv/ln instructions for cookbook hacking

With the addition of the 'package' cookbook the old trick no longer
works somehow.

aleksandrs-ledovskis/omnibus-gitlab,copystudy/omnibus-gitlab,copystudy/omnibus-gitlab,felixbuenemann/omnibus-gitlab,aleksandrs-ledovskis/omnibus-gitlab,aleksandrs-ledovskis/omnibus-gitlab,copystudy/omnibus-gitlab,gitlabhq/omnibus-gitlab,felixbuenemann/omnibus-gitlab,felixbuenemann/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab