Angular - update .json for Youtube Task

[lyutails]

hey there o/

• ⚙️ Update to an existing task

Updated dates for 'directives' task to achieve more diversity in cards' borders colour changing based on dates.
Plus checked videos and thumbnails availability.

Checklist

• ✅ I have performed a self-review of my own code.
• 📝 I have commented my code, particularly in hard-to-understand areas.
• 🚫 My changes generate no new warnings or errors.