add ui-sortble lib to be able to sort the list of the slide in the book view - it sends a post request to the server to update the slides' order
#!/usr/bin/env python
import os
import sys
if __name__ == "__main__":
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
from django.core.management import execute_from_command_line
execute_from_command_line(sys.argv)