Reduce number of targets to one
Reduce number of targets to one

We couldn't do this before, as some of the variables in `dev` target are
generated based on DEPLOY_ENV value.

We can override those to however, making it all seemless and making Make
happy with a single target at all times...

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf