Support the `node` application container/language for the p.sh recipe

This should be fairly straightforward to add however we may have a problem because the command you run to serve the app in production may not be the same command you want to run to develop the app locally.

TBD on how to resolve that problem.

**lets wait until we've got php mostly sorted out before we move on this**

Start by examining the p.sh recipe and the current PHP-related work, since the issue says PHP should be mostly sorted first. Trace how application containers and their commands are defined, then resolve how production and local development commands should differ; done means the node application container is supported without leaving that command choice undecided.

Written by the indexing model from the issue text.