[ci skip] docs: fix Nuxt badge icon

[IO-Fire]

🔗 Linked issue

nuxt/starter#1659

❓ 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

The Nuxt logo is missing from Nuxt badge in the README.md.

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See original issue from the module template for more details.