docs: creating new docs guide

[mattmaribojoc]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSDoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ 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

Adds description for how integrators can create Nuxt Content docs using our theme.

!! Blocked by https://github.com/vuestorefront/docs/pull/61 (which upgrades to latest Nuxt Content version) since this allows for usage with the most recent npx nuxi install commands.

📝 Checklist

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

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Latest commit: 515a4f5

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[mattmaribojoc]

@vuestorefront/integrations-team Can I have a review. This is a docs-related PR, so @rohrig approved but we are not part of the code owners for this repo.