remove kriss feed homepage and demo links (dead links, no such domain)

- ref. https://github.com/awesome-selfhosted/awesome-selfhosted/issues/2266

README.md

@@ -843,7 +843,7 @@ A [news aggregator](https://en.wikipedia.org/wiki/News_aggregator), also termed
 - [FreshRSS](https://freshrss.org/) - Self-hostable RSS feed aggregator. ([Demo](https://demo.freshrss.org/i/), [Source Code](https://github.com/FreshRSS/FreshRSS), [Clients](https://github.com/Alkarex/EasyRSS)) `AGPL-3.0` `PHP`
 - [Goeland](https://github.com/slurdge/goeland) - Reads RSS/Atom feeds and filter/digest them to create beautiful emails. `MIT` `Go`
 - [JARR](https://1pxsolidblack.pl/jarr-en.html) - JARR (Just Another RSS Reader) is a web-based news aggregator and reader (fork of Newspipe). ([Demo](https://www.jarr.info/), [Source Code](https://github.com/jaesivsm/JARR)) `AGPL-3.0` `Python`
-- [Kriss Feed](https://tontof.net/kriss/feed/) - Simple and smart (or stupid) feed reader. ([Demo](https://tontof.net/feed/), [Source Code](https://github.com/tontof/kriss_feed)) `CC0-1.0` `PHP`
+- [Kriss Feed](https://github.com/tontof/kriss_feed) - Simple and smart (or stupid) feed reader. `CC0-1.0` `PHP`
 - [Leed](https://github.com/LeedRSS/Leed) - Leed (for Light Feed) is a Free and minimalist RSS aggregator. `AGPL-3.0` `PHP`
 - [Leselys](https://github.com/toxinu/leselys) - Your very elegant RSS reader. `AGPL-3.0` `Python`
 - [Miniflux](https://miniflux.app/) - Miniflux is a minimalist and open source news reader, written in Go and PostgreSQL. ([Source Code](https://github.com/miniflux/v2)) `Apache-2.0` `Go`