feat(HedgeDoc): Remove dependency

hedgedoc/docker-compose.yml

@@ -9,8 +9,8 @@ services:
     container_name: ${HEDGEDOC_CONTAINER_NAME:-hedgedoc}
     image: ${HEDGEDOC_IMAGE:-linuxserver/hedgedoc:1.8.2-ls22}
     restart: always
-    depends_on:
-      - postgres
+    # depends_on:     # It's commented because docker `extends` don't support it
+    #   - postgres
     volumes:
       - hedgedoc:/config
       - /etc/timezone:/etc/timezone:ro