fix(remarkNormalizeLink)!: support relative path [subfolder](subfolder) which is equal to [subfolder](./subfolder)

[SoonIter]

Summary

1. support relative path [subfolder](subfolder) equal to [subfolder](./subfolder)

Before

[](installation) and [](installation.mdx) points to /installation which is strange ❌

After

[](installation) and [](installation.mdx) points to /guide/api/installation.html ✅

2. fix(RouteService): /zh should be /zh/

Related Issue

Checklist

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

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[SoonIter]

#1891 (comment)