hide 404 from main menu

_includes/header.html

@@ -8,7 +8,7 @@ <h1>
 			<div class="trigger">
 				{% assign pages = site.pages | sort:"nav_position"  %}
 				{% for my_page in pages %}
-					{% if my_page.title %}
+					{% if my_page.title and my_page.url != "/404.html" %}
 					<a class="page-link" href="{{ my_page.url | prepend: site.baseurl }}">{{ my_page.title }}</a>
 					{% endif %}
 				{% endfor %}