Setup faster development environment inside the VM

[lukechilds]

Currently the Umbrel development VM has an environment that very closely mirrors the production Umbrel OS environment.

This is great for checking changes are likely to work in Umbrel OS but it slows down development since it means Docker images need to be rebuilt and services restarted after each change.

It would be great if by default the dev VM used the development servers for development. So instead of building images and running services it just runs the npm dev scripts and benefits from live reload webservers etc.

We should still support the production-like docker environment too but we should be able to switch between them with something like umbrel-dev env production/umbrel-dev env development.

This command would handle automatically rebuilding the images or starting the dev server to reflect the latest changes.