use home helper everywhere
app-services exits silently without app/current

It's possible app-services will be run before the app's deployment sets
up the app's current directory
remove envvars already provided by template
re-run app-services if process/env changes

This idea isn't fully baked, but app services should be re-generated if
process types/counts change. Environment changes should trigger a
restart (or reload) of services, but there's currently no way to do that
yet. The app-services script will need to be buffed.