old_contents: from core import views
  
  from django.conf.urls import url
  from django.contrib import admin
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  
  admin.autodiscover()
  
  
  
  urlpatterns = [
      url(r'^admin/', admin.site.urls),
      url(r'^export/category/', views.CategoryExportView.as_view(),
          name='export-category'),
  ]
  
  urlpatterns += staticfiles_urlpatterns()
  
new_contents: from core import views
  
  from django.contrib import admin
  from django.contrib.staticfiles.urls import staticfiles_urlpatterns
  from django.urls import path
  from django.views.generic import RedirectView
  
  admin.autodiscover()
  
  urlpatterns = [
      path('', RedirectView.as_view(url='/admin/'), name="admin-site"),
      path('admin/', admin.site.urls),
      path('export/category/', views.CategoryExportView.as_view(), name='export-category'),
  ]
  
  urlpatterns += staticfiles_urlpatterns()
  
subject: Update demo app urls (#1128)