Add alt="" to navigator icons

_includes/navigator.njk

@@ -2,7 +2,7 @@
 {% for link in metadata.navigatorLinks %}
 	<div class="navigatorItem">
 		<a href="{{ link.linkURL }}">
-			<img src="{{ link.iconURL }}">
+			<img alt="" src="{{ link.iconURL }}">
 			<p>{{ link.linkDisplay }}</p>
 		</a>
 	</div>