New login screenshot

TopDog.tex

@@ -200,7 +200,7 @@ login username and password before contacting us (see \cref{sec:contact}).
 
 \begin{figure}
     \centering
-    \includegraphics[width=.9\linewidth]{shepherd-login.png}
+    \includegraphics[width=.9\linewidth]{login.png}
     \caption{The TopDog login page\label{fig:login}}
 \end{figure}