Convert JavaScript files to TypeScript

[neubig]

This PR converts all JavaScript files to TypeScript to ensure type safety across the codebase.

Changes made:

• Created TypeScript type definitions in /scripts/src/types/index.ts
• Converted github-api.js to TypeScript with proper type annotations
• Converted cache-github-data.js to TypeScript with proper type annotations
• Converted configuration files to TypeScript:
  • tailwind.config.js -> tailwind.config.ts
  • postcss.config.js -> postcss.config.ts
  • eslint.config.js -> eslint.config.ts
• Removed all original JavaScript files

All tests are passing after the conversion.

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