Moving Sharetribe to non-free Fix #2283

- Deleted Sharetribe from README.md
- Added Sharetribe to non-free.md

README.md

@@ -577,7 +577,6 @@ _CMS are a practical way to setup a website with many features. CMS often come w
 - [Pretix](https://pretix.eu/) - Django based ticket sales platform for events. ([Source Code](https://github.com/pretix)) `Apache-2.0` `Python`
 - [Reaction Commerce](https://reactioncommerce.com/) - Customizable, real-time reactive, JavaScript commerce platform. ([Source Code](https://github.com/reactioncommerce/reaction)) `GPL-3.0` `Nodejs`
 - [Saleor](http://getsaleor.com/) - Django based open-sourced e-commerce storefront. ([Demo](https://demo.getsaleor.com/), [Source Code](https://github.com/mirumee/saleor)) `BSD-3-Clause` `Python`
-- [Sharetribe](https://www.sharetribe.com) - An open source platform to create your own peer-to-peer marketplace, also available with SaaS model. ([Source Code](https://github.com/sharetribe/sharetribe)) `MIT` `Ruby`
 - [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`
 - [Shopware Community Edition](https://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`
 - [Spree Commerce](https://spreecommerce.org) - Spree is a complete, modular & API-driven open source e-commerce solution for Ruby on Rails. ([Demo](http://new-ux.spreecommerce.org/), [Source Code](https://github.com/spree/spree)) `BSD-3-Clause` `Ruby`

non-free.md

@@ -14,6 +14,8 @@
 - [Gazelle](https://github.com/WhatCD/Gazelle) - Gazelle is a web framework geared towards private BitTorrent trackers. Although naturally focusing on music, it can be modified for most needs. `unlicensed` `PHP`
 - [Kirby](https://getkirby.com/) `⊘ Proprietary` - File-based CMS. Easy to setup. Easy to use. Flexible as hell. ([Source Code](https://github.com/getkirby/kirby)) `PHP` 
 
+### E-Commerce
+- [Sharetribe](https://www.sharetribe.com) `⊘ Proprietary` - An open source platform to create your own peer-to-peer marketplace, also available with SaaS model. ([Source Code](https://github.com/sharetribe/sharetribe)) `Ruby`
 
 ## Communication Systems