fix: sidebar always matches "/"

[SoonIter]

Summary

if sidebar has '/', all the sidebar would match the first one, so we need to sort the key first

 {
	'/': [],
	'/guide': [
		{
			text: 'Getting Started',
			link: '/guide/getting-started',
		},
	],
	'/guide/item': []
},

Related Issue

#1780

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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