feat: add docs for registry

[shadcn]

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Name	Status	Preview	Updated (UTC)
ui	✅ Ready (Inspect)	Visit Preview	Jan 16, 2025 7:08pm

[lloydrichards]

Been keeping an eye on registry development as it relates to #1561 so was excited to see some canary releases on this 🥳 . Since nothing has been officially been released I've been bumbling through the repository-template and created https://github.com/lloydrichards/shadcn-storybook-registry

But i've noticed some issues with the routed functions which I assumed was the preferred method to distribute, but am seeing only the public route being mentioned in the docs here.

• https://shadcn-storybook-registry.vercel.app/r/button-story.json <- this works as expected
• https://shadcn-storybook-registry.vercel.app/registry/button-story <- get a server error: ENOENT: no such file or directory, open '/var/task/registry/button.stories.tsx'
• https://raw.githubusercontent.com/lloydrichards/shadcn-storybook-registry/refs/heads/main/public/r/button-story.json <- also works

thought: with the registry function you might need to use process.cwd() in front of the specified file path 🤔