docs: add image cropper docs

[nelsonlaidev]

Closes #

📝 Description

Preview: https://zag-website-git-docs-image-cropper-chakra-ui.vercel.app/components/react/image-cropper

⛳️ Current behavior (updates)

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🚀 New behavior

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💣 Is this a breaking change (Yes/No):

📝 Additional Information

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Latest commit: d312cf0

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[segunadebayo]

Nice work! Some thoughts after reviewing

• Let's visually hide the selection area until it's entirely measured (maybe with opacity or visibility hidden)
• Let's export handles from the package so users can import like imageCropper.handles and not have to this code below:

const handles: imageCropper.HandlePosition[] = [
  "top-left",
  "top",
  "top-right",
  "right",
  "bottom-right",
  "bottom",
  "bottom-left",
  "left",
]

• In the docs demo, let's have a button to show the preview of the cropped image