Add uri to "Edit cart" link on checkout view.
Add module for checkout routes.
Add list for cart on checkout view.
Add cart display to cart in main layout.
Fix input names for "Sign In" in main layout.
Show sign in form for the checkout view only if user isn't logged in.
Add input names to sign-in form on checkout view.
Replace "Cat1" with our category name.
Add "Logout" link and add uri to "Checkout" button.
Make "Add to cart" button work.
Hide list of attributes from cart.
Fix link on checkout form.
Add containers for logout and sign-in.