allow image zoom and rotate

html/overview.php

@@ -1,18 +1,14 @@
 <?php
 exec("docker ps -aq", $res, $ret);
 if ($ret!=0) {
-  echo 'digraph {';
   echo '  A [label="Error\nCannot get Docker Containers"];';
   echo '  B [label="Does the Webserver have Docker rights?"];';
   echo '  A->B [label="Probable\nCause"];';
-  echo '}';
   return;
 }
 exec("docker inspect ".join(" ", $res), $res2, $ret);
 if ($ret==0) {
   $containers=json_decode(join($res2), true);
-  echo "digraph {\n";
-  echo "  rankdir=LR;\n";
 
   foreach ($containers as $c) {
     $name = preg_replace(',^/,', '', $c['Name']);
@@ -82,11 +78,8 @@ if ($ret==0) {
       echo '"'.$name.'" -> "'.$in.':'.$out.'";',"\n";        
     }
   }
-  echo "}";
 } else {
-  echo 'digraph {';
   echo '  A [label="Error\nCannot Inspect Docker Container"];';
-  echo '}';
   return;
 }