Script to find and delete unused images

[Patrick Brosset (captainbrosset)]

This PR adds scripts/find-unused-images.js, a script which scans the "microsoft-edge" folder for "*-images" folders (each one holding the screenshots/pictures used by the article that shares its base name, e.g. "focus.md" -> "focus-images/") and detects image files inside them that are not referenced from their matching sibling article.

By default this runs in "dry run" mode and only prints a report of the unused images it finds. Pass --delete to actually delete them.

Usage:

• To find and list unused images, without deleting them: node scripts/find-unused-images.js
• To find unused images, and delete them: node scripts/find-unused-images.js --delete

Assumptions:

• Every "-images" folder is expected to sit right next to its matching ".md" article, in the same directory (e.g. "focus.md" and "focus-images/" are siblings).
• An image is considered "used" only if its filename (case-insensitive) is referenced from that one matching article file. A reference to an image of the same name from a different article does NOT count as "used" - each images folder is checked strictly against its own sibling article.
• If no matching ".md" article exists next to a "-images" folder, every image inside that folder is reported as unused (there is no article that could be using them).

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[learn-build-service-prod]

Learn Build status updates of commit 5e53ae6:

✅ Validation status: passed

File	Status	Preview URL	Details
scripts/find-unused-images.js	✅Succeeded

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