Wrap breadcumbs in navigation element

src/_includes/global/content.njk

@@ -1,5 +1,7 @@
 <header class="main__header">
     {% if isArticle or hasBreadcrumbs %}
+        <nav>
+            <h2 class="visually-hidden">Breadcrumbs</h2>
             <ul class="breadcrumbs">
                 {% set breadcrumbNavPages = collections.all | eleventyNavigationBreadcrumb(articleTitle or pageTitle or title) %}
                 {%- for entry in breadcrumbNavPages %}
@@ -8,6 +10,7 @@
                 </li>
                 {%- endfor %}
             </ul>
+        </nav>
     {% endif %}
 
     <h1>{{ articleTitle or pageTitle or title }}</h1>