Fixed issue with margins on API pages

[lamATnginx]

Proposed changes

Closes https://github.com/nginxinc/docs-platform/issues/507

Checklist

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

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md and CHANGELOG.md)

[github-actions]

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[nginx-jack]

Would you be able to add an example redocly page into the example site? 🥺

[lamATnginx]

Would you be able to add an example redocly page into the example site? 🥺

Done. Also removed the layout from documentation and moved it to the theme instead - nginx/documentation#578