update docker webapp guide for carbon (#1467)
update docker webapp guide for carbon (#1467)

* update docker webapp guide for carbon

- updates refrences of boron for carbon
- updates express package version in example (4.16.1 is latest stable)
- updates Dockerfile `COPY` (and instructions) to assume `npm@5+` and warn about `npm@4-`
- updates various stdout examples

* updates copy command to use wildcard to include package.json and package-lock.json

phillipj/new.nodejs.org,phillipj/new.nodejs.org,yous/new.nodejs.org,yous/new.nodejs.org,nodejs/new.nodejs.org,nodejs/new.nodejs.org