Added Quick Link for AI Powered API Testing

[adityachaudhary99]

What has changed?

Added a new Quick Link for AI Powered API testing at the top of the Documentation Quick Links section, alongside the Integration Testing link.

• The new link points to: Keploy API Testing Video
• Maintains the style, size, and design of the existing Integration Testing link for a consistent look and feel.

This PR Resolves #2925 on the Keploy Repo

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (if none of the other choices apply)

How Has This Been Tested?

• Ran npm run build and npm run serve to ensure the documentation site built and served locally without errors.
• Visually inspected the changes to confirm the AI Powered API testing quick link appears as intended and matches the style of the Integration Testing link.
• Clicked the new link to verify it opens the correct YouTube video in a new tab.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.

[keploy]

No significant changes currently retry

[github-actions]

Thank you and congratulations 🎉 for opening your very first pull request in keploy

[officialasishkumar]

LGTM!