arranged files into subdirectories

@@ -80,7 +80,7 @@
 
 
   \begin{textblock}{1.5}(1,27.5)
   \begin{textblock}{1.5}(1,27.5)
     \begin{tikzpicture}
     \begin{tikzpicture}
-      \node[inner sep=0pt] (snk) {\includegraphics[width=15mm]{logo-snakes}};
+      \node[inner sep=0pt] (snk) {\includegraphics[width=15mm]{../pix/logo-snakes}};
       \node[anchor=west,text width=6cm] at (snk.east)
       \node[anchor=west,text width=6cm] at (snk.east)
            {\tiny\color{gray}%
            {\tiny\color{gray}%
             \copyright~2018 Franck Pommereau\\[4pt]
             \copyright~2018 Franck Pommereau\\[4pt]