remove ympd (unmaintained since 2018) (#3723)

- ref. https://github.com/awesome-selfhosted/awesome-selfhosted/issues/3558
- WARNING:awesome_lint.py: ympd: last updated -1843 days, 4:04:51.288081 ago, older than 365 days
- ref. https://github.com/notandy/ympd/issues/189
- may be replaced by https://github.com/jcorporation/myMPD

README.md

@@ -1240,7 +1240,6 @@ _See also: [List of streaming media systems - Wikipedia](https://en.wikipedia.or
 - [Supysonic](https://github.com/spl0k/supysonic) - Python implementation of the Subsonic server API. `AGPL-3.0` `Python`
 - [SwingMusic](https://swingmusic.vercel.app/) - Swing Music is a beautiful, self-hosted music player and streaming server for your local audio files. Like a cooler Spotify ... but bring your own music. ([Source Code](https://github.com/swing-opensource/swingmusic)) `MIT` `Python`
 - [Volumio](https://volumio.com/) - A free and open source linux distribution, designed and fine-tuned exclusively for music playback. ([Source Code](https://github.com/volumio/Volumio2)) `GPL-3.0` `Nodejs`
-- [ympd](https://ympd.org/) - Standalone MPD Web GUI written in C, utilizing Websockets and Bootstrap/JS. ([Source Code](https://github.com/notandy/ympd)) `GPL-2.0` `C`
 
 
 ### Media Streaming - Multimedia Streaming