chore: Removed Shopping Cart Module

- Moved all files and web templates from Shopping Cart to E-commerce module
- Made Shopping Cart module obsolete
- Moved select E-commerce related files from Portal to E-commerce module
- Minor cleanups
- Fixed Shopping Cart and Product Configurator tests
diff --git a/erpnext/templates/pages/cart.py b/erpnext/templates/pages/cart.py
index 7c441f7..1f0cd5c 100644
--- a/erpnext/templates/pages/cart.py
+++ b/erpnext/templates/pages/cart.py
@@ -1,11 +1,9 @@
-# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
+# Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
-from __future__ import unicode_literals
 
 no_cache = 1
 
-
-from erpnext.shopping_cart.cart import get_cart_quotation
+from erpnext.e_commerce.shopping_cart.cart import get_cart_quotation
 
 
 def get_context(context):