Returns the collection without any given pages. Excluded pages can be specified by passing the entire $page object, the UID or full URI.
<h2>All pages except project-b</h2>
<ul>
<?php foreach($page->children()->not('project-b') as $subpage): ?>
<li>
<a href="<?php echo $subpage->url() ?>">
<?php echo html($subpage->title()) ?>
</a>
</li>
<?php endforeach ?>
</ul>