Fix Document Sorting

[amponce]

Summary

Fixes the document sorting issue and adds related test cases.

Bug

• Related issues linked using [fixes #231](https://github.com/avitorio/outstatic/issues/231)
• Integration tests added
• Errors have a helpful link attached, see contributing.md

New Behavior

icons.mp4

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3ae456e

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
outstatic-advanced-blog	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 25, 2024 1:19am
outstatic-dev-blog	❌ Failed (Inspect)			Jun 25, 2024 1:19am
outstatic-docs	❌ Failed (Inspect)			Jun 25, 2024 1:19am

[avitorio]

@amponce Great job! Thank you so much for this improvement. Merging it now!