remove feedka demo link (error 503)

README.md

@@ -1596,7 +1596,7 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
 - [Croodle](https://github.com/jelhan/croodle) - Croodle is an end-to-end encrypted web application to schedule a date or to do a poll on any topic. `MIT` `Javascript`
 - [docassemble](https://docassemble.org/) - A free, open-source expert system for guided interviews and document assembly, based on Python, YAML, and Markdown. ([Demo](https://demo.docassemble.org/run/legal), [Source Code](https://github.com/jhpyle/docassemble)) `MIT` `Docker`
 - [dudle](http://primelife.ercim.eu/results/opensource/63-dudle) - Online scheduling application. ([Demo](https://dudle.inf.tu-dresden.de/), [Source Code](https://github.com/kellerben/dudle)) `AGPL-3.0` `Ruby`
-- [Feedka](https://github.com/drabkirn/feedka) `⚠` - Open-source web application that can serve as a platform to get authentic, kindful, and constructive feedback from your friends, family, and co-workers. ([Demo](https://feedka.herokuapp.com)) `AGPL-3.0` `Ruby`
+- [Feedka](https://github.com/drabkirn/feedka) `⚠` - Open-source web application that can serve as a platform to get authentic, kindful, and constructive feedback from your friends, family, and co-workers. `AGPL-3.0` `Ruby`
 - [Fider](https://fider.io) - Open source alternative to UserVoice for customer feedback. ([Demo](https://demo.fider.io), [Source Code](https://github.com/getfider/fider)) `MIT` `Go`
 - [Framadate](https://framadate.org/abc/) - Online service for planning an appointment or make a decision quickly and easily: Make a poll, Define dates or subjects to choose, Send the poll link to your friends or colleagues, Discuss and make a decision. ([Demo](https://framadate.org/aqg259dth55iuhwm), [Source Code](https://framagit.org/framasoft/framadate?)) `CECILL-B` `PHP`
 - [Gancio](https://gancio.org/) - A shared agenda for local communities. ([Demo](https://demo.gancio.org/), [Source Code](https://framagit.org/les/gancio)) `AGPL-3.0` `Nodejs`