rewrite frontend and logic in core app

core/urls.py

@@ -0,0 +1,10 @@
+from django.contrib.auth.decorators import login_required
+from django.urls import path
+from django.views.generic import RedirectView
+
+from core.views import SubjectsView
+
+urlpatterns = [
+    path("", RedirectView.as_view(pattern_name="core:subjects", permanent=False), name="index"),
+    path("subjects/", login_required(SubjectsView.as_view()), name="subjects"),
+]