Add devenv down to shutdown services running in detached mode

[twittyc]

Hi, I'm currently leveraging the devenv up -d command to run detached processes and services. However, there does not seem to be a clear way to stop and shutdown theses processes and services. I was able to stop our process with devenv processes down, but this did not shutdown the postgres or redis service defined with services. It would be nice if there was an equivalent command to devenv up -d to also stop all running detached processes and services. Additionally, I'm new to learning nix and devenv so if there is an alternative or preferred way to shutdown these detached services please let me know. Thanks!

[domenkozar]

That's definitely missing, hope that someone picks this up!