docs: Update nextjs.mdx

[du2333]

Summary

fix scripts in the package.json

[hyperlint-ai]

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PR Change Summary

Updated the scripts in the package.json for better build and deployment processes.

• Modified the 'preview' script to include 'build' in the command.
• Updated the 'deploy' script to include 'build' in the command.

Modified Files

• src/content/docs/workers/frameworks/framework-guides/nextjs.mdx

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[vicb]

Thanks for your PR.
This is outdated now, the scripts have been updated already.