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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📦 Next.js Bundle Analysis for docs

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This PR introduced no changes to the JavaScript bundle! 🙌

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📦 Next.js Bundle Analysis for swr-site

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[dimaMachina]

@roelentless friendly ping