Update theme-configuration.mdx

[roelentless]

Without keys it appends tags, however in an earlier render faulty initial tags were already inserted first.
With keys, react will replace the first rendered tags.

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Name	Status	Preview	Comments	Updated (UTC)
nextra	⬜️ Ignored (Inspect)	Visit Preview		Feb 12, 2024 0:47am

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📦 Next.js Bundle Analysis for docs

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

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📦 Next.js Bundle Analysis for swr-site

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This PR introduced no changes to the JavaScript bundle! 🙌

[dimaMachina]

could you show an example? behaviour in screen or video, will be helpful for Nextra v3 too 🙏

[dimaMachina]

@roelentless friendly ping