old_contents: from django.conf.urls import include, url
  from django.views.generic import TemplateView
  
  from django.contrib import admin
  admin.autodiscover()
  
  from .views import index
  
  urlpatterns = [
      url(r'^$', index, name='main'),
      url(r'^accounts/', include('allauth.urls')),
      url(r'^autocomplete/', include('autocomplete_light.urls')),
      url(r'^stars/', include('stars.urls', namespace='stars')),
      url(r'^observers/', include('observers.urls', namespace='observers')),
      url(r'^observations/', include('observations.urls', namespace='observations')),
      url(r'^admin/', include(admin.site.urls)),
      url(r'^404/', TemplateView.as_view(template_name='404.html')),
  ]
  
new_contents: from django.conf.urls import include, url
  from django.views.generic import TemplateView
  
  from django.contrib import admin
  admin.autodiscover()
  
  from .views import index
  
  urlpatterns = [
      url(r'^$', index, name='main'),
      url(r'^accounts/', include('allauth.urls')),
      url(r'^stars/', include('stars.urls', namespace='stars')),
      url(r'^observers/', include('observers.urls', namespace='observers')),
      url(r'^observations/', include('observations.urls', namespace='observations')),
      url(r'^admin/', include(admin.site.urls)),
      url(r'^404/', TemplateView.as_view(template_name='404.html')),
  ]
  
subject: Remove old URL config.