fix(locale): remove emoji fallback for Chinese

[toto6038]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR addresses the problem that maps all Chinese variants (zh-*) into 🇨🇳 in the supported language section. The change respects each variants' major user countries while remaining flexibility for other variants like zh-HK, i.e. Traditional Chinese (Hong Kong).

Also, I wonder if docs/server/api/locales.json.get.ts is unnecessary and can be removed as the emoji is determined from code property in each locale configuration.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@3134

commit: 1cf179d