Simplify audiobookshelf volume configuration

Use local storage for application data and single NFS volume:
- /srv/audiobookshelf/config - local application config
- /srv/audiobookshelf/metadata - local metadata database
- NFS volume: /mnt/user/media/audiobooks (contains library/ and untagged/ subdirs)

audiobookshelf/docker-compose.yaml

@@ -4,30 +4,12 @@ networks:
       name: npm-network
 
 volumes:
-  config:
+  audiobooks:
     driver: local
     driver_opts:
       type: nfs
       o: "addr=192.168.1.192,rw,nolock,soft"
-      device: ":/mnt/user/media/audiobooks/config"
-  metadata:
-    driver: local
-    driver_opts:
-      type: nfs
-      o: "addr=192.168.1.192,rw,nolock,soft"
-      device: ":/mnt/user/media/audiobooks/metadata"
-  library:
-    driver: local
-    driver_opts:
-      type: nfs
-      o: "addr=192.168.1.192,rw,nolock,soft"
-      device: ":/mnt/user/media/audiobooks/library"
-  untagged:
-    driver: local
-    driver_opts:
-      type: nfs
-      o: "addr=192.168.1.192,rw,nolock,soft"
-      device: ":/mnt/user/media/audiobooks/untagged"
+      device: ":/mnt/user/media/audiobooks"
 
 services:
   audiobookshelf:
@@ -41,10 +23,9 @@ services:
       - VIRTUAL_PORT=80
       - LETSENCRYPT_HOST=audiobookshelf.kolpacksoftware.com
     volumes:
-      - config:/config
-      - metadata:/metadata
-      - library:/audiobooks
-      - untagged:/untagged
+      - /srv/audiobookshelf/config:/config
+      - /srv/audiobookshelf/metadata:/metadata
+      - audiobooks:/audiobooks
     ports:
       - 13378:80
     restart: unless-stopped