Update Airsonic to Airsonic Advanced (#2802)

Airsonic isn't maintained anymore. See issue #2672
Updated Airsonic to Airsonic Advanced

README.md

@@ -1107,7 +1107,7 @@ _See also: [List of streaming media systems - Wikipedia](https://en.wikipedia.or
 
 **[`^        back to top        ^`](#)**
 
-- [Airsonic](https://airsonic.github.io/) - Open-source web-based media streamer and jukebox. A fork of Subsonic's last open-source release, before it switched licenses. ([Source Code](https://github.com/airsonic/airsonic), [Clients](https://airsonic.github.io/docs/apps/)) `GPL-3.0` `Java`
+- [Airsonic Advanced](https://github.com/airsonic-advanced/airsonic-advanced/) - Open-source web-based media streamer and jukebox based on Airsonic, with several key performance and feature enhancements. `GPL-3.0` `Java`
 - [Ampache](https://ampache.org/) - Web based audio/video streaming application. ([Demo](https://play.dogmazic.net/), [Source Code](https://github.com/ampache/ampache)) `AGPL-3.0` `PHP`
 - [Audioserve](https://github.com/izderadicka/audioserve) - Simple personal server to serve audio files from directories (audiobooks, music, podcasts...). Focused on simplicity and supports sync of play position between clients. `MIT` `Rust`
 - [AzuraCast](https://www.azuracast.com/) - A modern and accessible self-hosted web radio management suite. ([Source Code](https://github.com/AzuraCast/AzuraCast)) `Apache-2.0` `PHP`