add support for shadcn monorepo configuration

[yamz8]

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https://ui.shadcn.com/docs/monorepo

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[haydenbleasel]

@yamz8 I checked out the new monorepo configuration from shadcn/ui. It's a bit complicated for what we're trying to do here. It requires each app to have a components.json file and that they all match. Feels a bit simpler to just to run something like this from the root:

npx shadcn@latest add button -c packages/design-system

What do you reckon?