upnp-renderer-pulse: corrected user mapping

Subsonic: remove obsolete way to use newer versions of the plugin

Add link to release.md

Correct RESTART_MODE in sample.env

Add systemd unit

reduce mountpoint and avoid restart

Update friendly name

Correct project name on pulse

Add option for IMAGE_TAG

Add support for a pulseaudio configuration (works with pipewire as well)

Using external volume

Add variant with volume

Remove options for downloading plugin at container runtime

Add support for TIDAL_ENABLE_USER_AGENT_WHITELIST

Update sample.env