feat: multi-root workspaces

[trevorpfiz]

https://code.visualstudio.com/docs/editor/multi-root-workspaces

I came across next-fast-turbo when adding a FastAPI to a Turborepo, and I enjoyed the development experience of using multi-root workspaces. https://next-fast-turbo.mintlify.app/documentation/local-development#working-with-a-monorepo-in-vs-code

Any experience working with multi-root workspaces? One issue I noticed is that there is some overlap between the root launch.json configurations and the ones defined in .code-workspace. Leads to this when working in the multi-root workspace:

I don't have enough experience to say, but we could recommend multi-root workspaces in the README and then remove the root launch.json, but only if there are clear advantages to working with Turborepo in a multi-root workspace.