Readme: Update Next.js v14 min requirements

[theodesp]

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Description

Added note in README about min requirements for Next.js vs 14

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[changeset-bot]

⚠️ No Changeset found

Latest commit: b3fce66

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[github-actions]

📦 Next.js Bundle Analysis for @faustwp/getting-started-example

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

This PR introduced no changes to the JavaScript bundle! 🙌