fixup creation/running file

run

@@ -1,8 +1,15 @@
 #!/usr/bin/env bash
-docker build -t dt0 .
+docker stop dt0
+docker rm dt0
+docker stop dt-db
+docker rm dt-db
+docker network create web
 docker network create dt-db
+
+docker build -t dt0 .
 docker run -d --restart always --name dt-db --network dt-db \
   -v "$PWD/db":/var/lib/postgresql/data postgres:10.5-alpine
+sleep 5   # give Postgres time to start
 docker run -d --restart always --name dt0 --network dt-db \
   dt0:latest
 docker network connect web dt0