docs(deps): update `@nuxt/content` to `alpha.6`

[benjamincanac]

🔗 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

📝 Checklist

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

[cloudflare-workers-and-pages[bot]]

Deploying ui3 with    Cloudflare Pages

Latest commit:	303cd7c
Status:	✅  Deploy successful!
Preview URL:	https://71b6d94a.ui-6q2.pages.dev
Branch Preview URL:	https://docs-content-alpha-6.ui-6q2.pages.dev

View logs

[pkg-pr-new[bot]]

pnpm add https://pkg.pr.new/@nuxt/ui@2692

commit: 303cd7c