fix: docker-compose backend volume (#8)

Author: catch-21

docker-compose.yml

@@ -11,7 +11,7 @@ services:
       - PORT=3001
       - NODE_ENV=production
     volumes:
-      - ./backend/data/bitcoin_locations.db:/app/data/bitcoin_locations.db
+      - ./backend/data:/app/data
     restart: unless-stopped
 
   frontend: