fix: correct sorting for nested nav items

[lightstrike]

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What does this implement/fix? Explain your changes.

Fixes wonky ordering for Guides section of doc.

Does this close any currently open issues?

Don't believe so.

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Where has this been tested?

• WooGraphQL Version: …
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[kidunot89]

@lightstrike As you know I ended up doing a complete rebuild, thanks for this tho, bro 👋🏿 .