happa release v1.15.2

Our streak to add more Management API guides to the UI continues.

Added

• Add Management API guide for listing a cluster’s node pools (#2641)
• Add Management API guide for deleting a node pool (#2644)
• Add Management API guide for modifying a node pool (#2643)
• Add Management API guide to list installed apps (#2640)
• Add Management API guide to the key pairs list (#2639)