Update file-structure.mdx to Blitz Toolkit Structure

[siddhsuresh]

• [x] replace blitz.config.js to next.config.js
• [x] remove pages directory from app/auth and add it to pages/auth
• [x] remove babel.config.js
• [x] convert file names in projects/ from .js to .ts and .tsx

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Name	Status	Preview	Updated
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