replace docker socket networking hack

[lukemarsden]

indeed, you have what you need in the Python API to remove your socat for the demo:

    with dagger.Connection(dagger.Config(log_output=sys.stderr)) as client:
        # get socket id from the host
        socket = client.host().unix_socket("/var/run/docker.sock")
        # mount the socket into the container
        container = client.container().with_unix_socket("/var/run/docker.sock", socket)

• remove reference to socat in the readme