Add @codingStandardsIgnoreFile to index.php.dist

The comments of the "instance Pico" section violate PSR-2, but we want to keep them anyway

index.php.dist

@@ -1,4 +1,4 @@
-<?php
+<?php // @codingStandardsIgnoreFile
 
 // check PHP version
 if (version_compare(PHP_VERSION, '5.3.6', '<')) {