feat!: Implement navigation neighbors

[theetherGit]

Breaking change:

• Anchor and section items requires description now.

Implementation:

1. Flatten the navigation config
2. Clean the config as per requirement
3. Pre-calculate the map for navigation neighbor for pathname. We can use this other implementation which computes as per required pathname.

Preview:

demo-navigation-neighbors-1.mov

[changeset-bot]

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Latest commit: 299c251

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[theetherGit]

@huntabyte do i need to add Changeset and version bump ?

What i need todo

• Update the start for new changes.

[huntabyte]

Yeah it can be a minor bump for this!

[huntabyte]

I don't think we should include releases as part of the flow though tbh, we can likely just filter that one out!

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[theetherGit]

@huntabyte Does the preview upload always fail?