Add wrangler installation step in Next.js workers guide

[mazn4]

Summary

The current documentation for setting up a Next.js application with Cloudflare Workers is missing the Wrangler CLI installation step.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added installation instructions for the Wrangler CLI in the Next.js Workers guide to enhance the setup process for users.

• Included a step to install the Wrangler CLI as a devDependency
• Renumbered subsequent steps to reflect the addition of the new installation step
• Updated the documentation to ensure clarity in the setup process

Modified Files

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

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