Intro checker only scans three folders deep

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 7.0.x, 7.1.x, 7.2.x
• Component/s: Developer Network
• Labels: None
• Type of Documentation: Deployment
• Git Pull Request: https://github.com/sez11a/liferay-docs/pull/4382

When running the check-intros task, it's not scanning folders nested more than three levels deep. For example, these are checked:

../articles/

../articles/folder1/

../articles/folder1/folder2

But these are not

../articles/folder1/folder2/folder3/etc...

This is causing folders without intros to be merged, causing publication issues.

In addition, folders that do not have any Markdown files are not being properly checked. Fix this too.