Remove python2 support

src/manage.py

@@ -6,17 +6,10 @@ if __name__ == "__main__":
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "kszkepzes.settings")
     try:
         from django.core.management import execute_from_command_line
-    except ImportError:
-        # The above import may fail for some other reason. Ensure that the
-        # issue is really that Django is missing to avoid masking other
-        # exceptions on Python 2.
-        try:
-            import django
     except ImportError:
         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?"
         )
-        raise
     execute_from_command_line(sys.argv)