Docker: migrate from bind mounts to named volumes

docker/tvheadend/docker-compose.toml

@@ -1,11 +1,15 @@
+[volumes]
+config = {}
+picons = {}
+
 [services.tvheadend]
 image = "linuxserver/tvheadend"
 container_name = "tvheadend"
 environment = ["TZ=Europe/Helsinki", "PUID=1000", "PGID=985"]
 volumes = [
-  "/docker/tvheadend:/config",
+  "config:/config",
+  "picons:/picons",
   "/mnt/Storage/Media/PVR:/recordings",
-  "/mnt/Storage/picons:/picons",
   "/etc/localtime:/etc/localtime:ro",
 ]
 ports = ["9981:9981", "9982:9982"]