* use --no-cache so repository index isn't included in image
* use FROM instructions to build project with dev dependencies, then copy built project to new stage and install production-only libraries
* properly ignore docs and node_modules with dockerignore
* Check for in-use web port before starting so we can display a useful error message
* Remove 'web' command and instead make it an optional argument for `run` (default to web)
* Update dockerfile to use run command
* Remove remaining commander option defaults since they are defined in config builder now
