fix netlify url preview

[nginx-jack]

Proposed changes

Problem: Netlify preview url is not rendering properly

Solution: Fix url to be postfixed with /nginx-gateway-fabric/

Testing: PR creation should generate a preview url.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[netlify]

✅ Deploy Preview for nginx-gateway-fabric ready!

Name	Link
🔨 Latest commit	5a4a390
🔍 Latest deploy log	https://app.netlify.com/sites/nginx-gateway-fabric/deploys/65709c2aea0bb9000806cb97
😎 Deploy Preview	https://deploy-preview-1344--nginx-gateway-fabric.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[ADubhlaoich]

LGTM. I flagged this issue earlier when clicking the preview for my open PR.