remove yclas (#3086)

yclas isn't anymore an opensource project.  The source code now cost $250 and can be purchase by their website. yclas user repositories now consist just in few tools that you can use for deployment the code.

README.md

@@ -784,7 +784,6 @@ _Related: [Community-Supported Agriculture (CSA)](#community-supported-agricultu
 - [Thelia](https://thelia.net/) - Thelia is an open source and flexible e-commerce solution. ([Demo](https://demo.thelia.net/), [Source Code](https://github.com/thelia/thelia)) `LGPL-3.0` `PHP`
 - [Vendure](https://www.vendure.io) - A headless commerce framework. ([Demo](https://demo.vendure.io), [Source Code](https://github.com/vendure-ecommerce/vendure)) `MIT` `Nodejs`
 - [WooCommerce](https://woocommerce.com/) - WordPress based e-commerce solution. ([Source Code](https://github.com/woocommerce/woocommerce)) `GPL-3.0` `PHP`
-- [Yclas](https://yclas.com/) - Free open-source, self-hosted CMS for classifieds sites. ([Source Code](https://github.com/yclas/yclas)) `GPL-3.0` `PHP`
 
 
 ### Federated Identity & Authentication