fix(navigation): prevent duplicate nodes

[farnabaz]

🔗 Linked issue

resolves #2958

❓ 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

Index files should be merged with duplicate siblings

📝 Checklist

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

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/content@2959

commit: 5c4a795

[maximepvrt]

@farnabaz I believe there's an issue with how the stem field is handled for parent items when they have children.

For example, currently:

{
  "title": "index",
  "path": "/devenir-benevole",
  "stem": "devenir-benevole/index",
  "children": [
    {
      "title": "bourg-en-bresse",
      "path": "/devenir-benevole/bourg-en-bresse",
      "stem": "devenir-benevole/bourg-en-bresse"
    },
    {
      "title": "index",
      "path": "/devenir-benevole",
      "stem": "devenir-benevole/index"
    }
  ]
}

I think the stem for the parent should instead represent the folder itself when it has children, as it acts as a directory rather than just the file. This would make it more consistent.

Proposed output:

{
  "title": "index",
  "path": "/devenir-benevole",
  "stem": "devenir-benevole",
  "children": [
    {
      "title": "bourg-en-bresse",
      "path": "/devenir-benevole/bourg-en-bresse",
      "stem": "devenir-benevole/bourg-en-bresse"
    },
    {
      "title": "index",
      "path": "/devenir-benevole",
      "stem": "devenir-benevole/index"
    }
  ]
}

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[farnabaz]

@maximepvrt should be good now :)