updated docs about migrating celery in Django
updated docs about migrating celery in Django

South is deprecated because Django has migrations native now

axiom-data-science/django-celery,axiom-data-science/django-celery,celery/django-celery,kanemra/django-celery,kanemra/django-celery,georgewhewell/django-celery,georgewhewell/django-celery,georgewhewell/django-celery,celery/django-celery,kanemra/django-celery,celery/django-celery,axiom-data-science/django-celery