fix: predefined bug port

[sbsangu]

Description

• Removed the fixed port (3000) specification from the dev script in package.json.
• Enabled Next.js to automatically shift to the next available port if the default port (3000) is busy.
• Ensured smoother development experience without port conflicts.

Related issue(s)

Fixes #3070

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[asyncapi-bot]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🔴 Performance	36
🟢 Accessibility	98
🟢 Best practices	92
🟢 SEO	100
🟠 PWA	56

Lighthouse ran on https://deploy-preview-3077--asyncapi-website.netlify.app/

[sambhavgupta0705]

@akshatnema ptal

[sambhavgupta0705]

/update

[sbsangu]

@sambhavgupta0705 @akshatnema @Saumya40-codes Is it going to be merged?

[akshatnema]

/rtm