Handle large number of tabs via scroll

[lamATnginx]

Proposed changes

Handle case in Tabs shortcode for large number of tabs.

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]

Great 👌 .