Remove Feedbin

Feedbin is no longer awesome, it has moved to a paid subscription service and is explicitly directing people looking to self-host toward other solutions. Per their github page:

```Feedbin's goal is to be a great web-based RSS service. This goal is at odds with being a great self-hosted RSS reader. There are a lot of moving parts and things to configure, so for that reason I do not recommend that you run Feedbin in production.```

README.md

@@ -675,7 +675,6 @@ _See https://github.com/n1trux/awesome-sysadmin#identity-management_
 **[`^        back to top        ^`](#)**
 
 - [CommaFeed](https://www.commafeed.com/) - Google Reader inspired self-hosted RSS reader. ([Source Code](https://github.com/Athou/commafeed)) `Apache-2.0` `Java`
-- [Feedbin](https://feedbin.com/) - Simple, fast and nice looking RSS reader. ([Source Code](https://github.com/feedbin/feedbin)) `MIT` `Ruby`
 - [FeedHQ](https://feedhq.org/) - FeedHQ is a web-based feed reader. ([Source Code](https://github.com/feedhq/feedhq)) `BSD-3-Clause` `Python`
 - [FreshRSS](http://freshrss.org/) - Self-hostable RSS feed aggregator. ([Demo](http://demo.freshrss.org/i/), [Source Code](https://github.com/FreshRSS/FreshRSS), [Clients](https://github.com/Alkarex/EasyRSS)) `AGPL-3.0` `PHP`
 - [JARR](http://1pxsolidblack.pl/jarr-en.html) - JARR (Just Another RSS Reader) is a web-based news aggregator and reader (fork of Newspipe). ([Demo](https://jarr.info/login?next=%2F), [Source Code](https://github.com/jaesivsm/JARR)) `AGPL-3.0` `Python`