Update index.md

[pazazdigital]

fixed typo in the installation command

🔗 Linked issue

❓ Type of change

• [x] 📖 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

[netlify[bot]]

✅ Deploy Preview for nuxt-color-mode canceled.

Name	Link
🔨 Latest commit	d1b55cc6be1c2553c3f0f902b8eac4927b253338
🔍 Latest deploy log	https://app.netlify.com/sites/nuxt-color-mode/deploys/66f3ed2e579ce000089704d4