product varient change list bug fix order item change quantity and remove

backend/order/urls.py

@@ -0,0 +1,8 @@
+from django.conf.urls.static import static
+from django.contrib import admin
+from django.urls import path, include
+from .views import CartItemViews
+
+urlpatterns = [
+    path('cart/item/<int:pk>', CartItemViews.as_view(), name='add cart'),
+]