Don't make the user get a container already exists error

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
I don't want to do inline code comments. Can we break this into two commands and make the comment mainline text.

First, we need to delete the `web` container we created previously because unique, etc, etc.

    $ docker rm -f web

Now we can create the new one...