write the db data into a local folder

I prefer to have everything related to a project in one single directory
that way I know where to look for it.

docker-compose.yml

@@ -1,8 +1,5 @@
 version: '3'
 
-volumes:
-  db_data:
-
 services:
   db:
     image: postgres
@@ -10,7 +7,7 @@ services:
       - POSTGRES_DB
       - POSTGRES_PASSWORD
     volumes:
-      - db_data:/var/lib/postgresql/data/
+      - ./db_data:/var/lib/postgresql/data/
 
   web:
     image: nebucatnetzer/network_inventory