Drop files not necessary after merge

biscuit/core/manage.py

-#!/usr/bin/env python3
-import os
-import sys
-
-sys.path = ["/srv/sites/school-apps/env/lib/python3.5/site-packages/"] + sys.path
-
-if __name__ == "__main__":
-    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "schoolapps.settings")
-    try:
-        from django.core.management import execute_from_command_line
-    except ImportError as exc:
-        raise ImportError(
-            "Couldn't import Django. Are you sure it's installed and "
-            "available on your PYTHONPATH environment variable? Did you "
-            "forget to activate a virtual environment?"
-        )
-    execute_from_command_line(sys.argv)