Update index.mdx

[ax-6]

I learned that the simplified Chinese version of index.mdx was outdated, so I updated it based on the English version of index.mdx.

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Lunaria Status Overview

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By default, every PR changing files present in the Lunaria configuration's files property will be considered and trigger status changes accordingly.

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Tracked Files

Locale	File	Note
zh-cn	index.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[delucis]

Thank you @ax-6! In fact this was an error in our i18n tracking system.

#1784 changed some frontmatter in the English homepage, marking the page as needing updating.

We then updated all translations in #2233 but used our i18nIgnore keyword, which means it did not mark the page as up-to-date.

Nevertheless, the page was already updated. Thanks all the same!