fix(<ContentDoc>): render blink in SSG

[farnabaz]

🔗 Linked issue

resolves #1583

❓ 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 like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

In SSG on client hydration useRoute().path contains additional slash at the end of path which cause cache miss in asyncData.
ContentDoc is responsible for fetching single content, so we can safely remove this trailing slash.

📝 Checklist

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

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