Grok inspired shopping cart plugin

Copy the stripe-cart directory into user/plugins

Add cart and success pages to user/pages

launch admin->plugins->stripe-cart page

1. Edit the API keys from stripe dashboard -- test or live mode
2. Edit the success and cancel URLs
   1. typically http://127.0.0.1/DIRECTORY during localhost checking
   2. to https://WEBSITE when live

On each item for sale page

1. enable twig on the page
2. {{ add_to_cart_button('ARMstamp LPC11U37', 25.00) }}

Update shipping cost values in stripe-create-session.php