Summary: Added NCUK & University of Leeds program

Why It Matters: This shows a new school partnership.

What Changed:

• Added a link for "NCUK & University of Leeds" under UPC Internacional.
• Removed a section about "¡REALIZA TU MATRÍCULA!"
• Updated the text for "¡Futuro UPCino, conversemos!" to say "Inscripciones abiertas" instead of "Inicio de clases: 25 de agosto."