The artifactId now resolves to quickstart-parent instead of the quickstart name

A change to the build broke the README.html generation.

The `artifactId` used to resolve to the specific quickstart name when generating the README.html file from README.adoc. It now generates `quickstart-parent` for all of the quickstarts.

This means you end up with this instruction for the kitchensink quickstart:

This deploys the quickstart-parent/target/quickstart-parent.war to the running instance of the server.

It used to generate:

This deploys the kitchensink/target/kitchensink.war to the running instance of the server.

It is also no longer possible to build an individual quikstart README file. You have to build all of them from the top level.