[migration] unify process_script command - simplify wrapper by putting the logic in the migration module - enable sql script in shell invocation - adjust cmd_process_script docstring in interactive shell

* {
  color: #000 !important;
}

div#popupLoginBox,
div#popupLoginBox,
img#logo, div.header,
#navColumnLeft, #navColumnRight,
#footer {
  display: none
}

div#pageContent{
  border: none;
}