Added coloration on first slide title

principal.tex

@@ -1,7 +1,7 @@
 \section{Model Context}
 \label{sec:context-of-the-model}
 \begin{frame}
-    \frametitle{(Why) A network?}
+    \frametitle{Why \alert<1>{a network?}}
     \begin{columns}
         \begin{column}{0.55\textwidth}
             \begin{columns}