Update instructions to use docker-compose only

docker-compose-postgres.yml

@@ -12,6 +12,8 @@ services:
       - spring.datasource.password=webgoat
       - spring.datasource.driver-class-name=org.postgresql.Driver
       - spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQL94Dialect
+       - webgoat.server.directory=/home/webgoat/.webgoat/
+        - webgoat.user.directory=/home/webgoat/.webgoat/
     ports:
       - "8080:8080"
   webwolf:
@@ -27,6 +29,9 @@ services:
   db:
     container_name: webgoat_db
     image: postgres:latest
+# Uncomment to store the state of the database on the host.
+#    volumes:
+#      - ./database:/var/lib/postgresql
     environment:
       - POSTGRES_PASSWORD=webgoat
       - POSTGRES_USER=webgoat