[hi] Translate Setup page

[karannakra2]

Summary

This PR provides the Hindi translation for the Setup documentation page (src/content/learn/setup.md).

Changes

• Translated all English text to Hindi, ensuring a natural and technical tone.
• Terminological Consistency: Kept core React terms like React Developer Tools, React
  Compiler, TypeScript, Props, and State to maintain technical clarity.
• Link Integrity: Updated all internal Markdown links to ensure they point to the correct
  sections.
• Anchor Tags: Preserved all custom heading IDs (e.g., {/editor-setup/}) to maintain
  deep-linking functionality.

Checklist

• Translation verified for grammatical correctness in Hindi.
• All Markdown links and internal anchors are functional.
• Code blocks and technical terms have been handled according to project standards.
• Ran yarn check-all to ensure no linting or formatting regressions.

Screenshots - Before

Screenshots - After

[karannakra2]

Review needed please @arshadkazmi42