remove shuup (unmaintained since 2021)

- https://github.com/shuup/shuup/commits/master

README.md

@@ -808,7 +808,6 @@ _Related: [Community-Supported Agriculture (CSA)](#community-supported-agricultu
 - [s-cart](https://s-cart.org/) - S-Cart is a free e-commerce website project for individuals and businesses, built on top of Laravel Framework. ([Demo](https://demo.s-cart.org/), [Source Code](https://github.com/s-cart/s-cart)) `MIT` `PHP`
 - [Saleor](https://saleor.io) - Django based open-sourced e-commerce storefront. ([Demo](https://demo.getsaleor.com/), [Source Code](https://github.com/mirumee/saleor)) `BSD-3-Clause` `Python`
 - [Shopware Community Edition](https://www.shopware.com/community/) - PHP based open source e-commerce software made in Germany. ([Demo](https://www.shopware.com/en/test-demo/), [Source Code](https://github.com/shopware/platform)) `MIT` `PHP`
-- [Shuup](https://www.shuup.com/) - Django powered fully customizable open source e-commerce framework for small and large sites. ([Source Code](https://github.com/shuup/shuup)) `AGPL-3.0` `Python`
 - [Solidus](https://solidus.io/) - A free, open-source ecommerce platform that gives you complete control over your store. ([Demo](http://demo.solidus.io/), [Source Code](https://github.com/solidusio/solidus)) `BSD-3-Clause` `Ruby`
 - [Spree Commerce](https://spreecommerce.org) - Spree is a complete, modular & API-driven open source e-commerce solution for Ruby on Rails. ([Demo](https://new-ux.spreecommerce.org/), [Source Code](https://github.com/spree/spree)) `BSD-3-Clause` `Ruby`
 - [Sylius](https://sylius.com) - Symfony2 powered open source full-stack platform for eCommerce. ([Demo](https://sylius.com/try/), [Source Code](https://github.com/Sylius/Sylius)) `MIT` `PHP`