Add real world case study to T4

Author: pol-rivero

T4.ArchitecturalPatterns.tex

@@ -107,7 +107,7 @@ \section{Block A - Introduction to Architectural Patterns}
     \item is about the \textbf{high-level structure} of the software system.
     \item defines \textbf{major components}, their responsibilities, and how they interact.
     \item has a large impact on its \textbf{reliability, security, scalability and performance}.
-    \item An architectural mistake is much \textbf{harder to fix} after the fact.
+    \item An architectural mistake is much \textbf{harder to fix} after the fact.\footnote{Real-world case study: \href{https://web.archive.org/web/20240325042615/https://www.primevideotech.com/video-streaming/scaling-up-the-prime-video-audio-video-monitoring-service-and-reducing-costs-by-90}{Why Amazon Prime Video had to switch back from microservices to a monolith.}}
   \end{itemize}