<nav class=“site_header”>

<a class="page-link" href="{{ "/" | relative_url }}">{{ site.title | escape }}</a>
{% assign default_paths = site.pages | map: "path" %}
{% assign page_paths = site.header_pages | default: default_paths %}
{% for path in page_paths %}
  {% assign my_page = site.pages | where: "path", path | first %}
  {% if my_page.title || my_page.menu_title %}
    {% assign title = my_page.menu_title ? my_page.menu_title : my_page.title %}
    <a class="page-link" href="{{ my_page.url | relative_url }}">{{ title | escape }}</a>
  {% endif %}
{% endfor %}

</nav>