Remove docker-clean custom script

$ docker system prune

bin/docker-clean

@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-
-# Per https://lebkowski.name/docker-volumes/
-
-# remove exited containers:
-docker ps --filter status=dead --filter status=exited -aq | xargs -r docker rm -v
-
-# remove unused images:
-docker images --no-trunc | grep '<none>' | awk '{ print $3 }' | xargs -r docker rmi
-
-# remove unused volumes:
-docker volume ls -qf dangling=true | xargs -r docker volume rm