Set the grid row height to fit content instead of auto

[lamATnginx]

Proposed changes

Closes https://github.com/nginxinc/docs-platform/issues/412

Before:

After:

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)

[nginx-jack]

Does this have any impact on the pages that looked okay before this change? 🤔 For better, or worse?

[lamATnginx]

As far as I can tell from randomly selecting pages to manually test, no changes.