Added urls and imported view functions for the new pages

lance_santuyo_reading/bookshelf/urls.py

 from django.urls import path
-from .views import index
+from .views import (
+    HomepageView,
+    BooksPageView, BooksDetailsView,
+    AuthorsPageView, AuthorsDetailsView
+)
 
 urlpatterns = [
-    path('', index, name='index'),
+    path('home/', HomepageView.as_view(), name='home'),
+    path('books/', BooksPageView.as_view(), name='books'),
+    path('books/<int:pk>/details/', BooksDetailsView.as_view(), name='book-item'),
+    path('authors/', AuthorsPageView.as_view(), name='authors'),
+    path('authors/<int:pk>/details/', AuthorsDetailsView.as_view(), name='author-item'),
 ]
 
 app_name = "bookshelf"