kippo-graph: remove image caching

kippo-graph/nginx.conf

@@ -56,11 +56,6 @@ http {
     	root /kippo-graph;
     	index index.php index.html;
 
-    	location ~* \.(jpg|jpeg|gif|css|png|js|map|woff|woff2|ttf|svg|eot)$ {
-    		expires 30d;
-    		access_log off;
-	}
-
         location ~ ^/(data|cfg|tmp) {                                        
             deny all;                                                        
         }