flake8 fix

general/urls.py

 from django.conf import settings
 from django.conf.urls.static import static
 from django.conf.urls import include, url
-from django.urls import path
 from django.contrib import admin
 from django.views.generic.base import RedirectView
 import django_cas_ng.views

general/views.py

-from django.shortcuts import render
-from django.contrib.auth.models import User, Group
+from django.contrib.auth.models import Group
 from backend.utils import is_member
 from django.http import HttpResponse
 import re