{% assign all_pages = site.data.navigation.chapters | concat: site.data.navigation.concepts | concat: site.data.navigation.sources | concat: site.data.navigation.examples %}
{% assign last_item = nil %}
{% assign previous_item = nil %}
{% assign next_item = nil %}
{% assign found_current = false %}
{% for item in all_pages %}
  {% if found_current %}
    {% assign next_item = item %}
    {% break %}
  {% endif %}
  {% if item.url == page.url %}
    {% assign previous_item = last_item %}
    {% assign found_current = true %}
  {% endif %}
  {% assign last_item = item %}
{% endfor %}

{% if previous_item or next_item %}
  <nav class="pager" aria-label="Navigation entre pages">
    {% if previous_item %}
      <a class="pager__link" href="{{ previous_item.url | relative_url }}">
        <span>Précédent</span>
        {{ previous_item.title }}
      </a>
    {% endif %}
    {% if next_item %}
      <a class="pager__link pager__link--next" href="{{ next_item.url | relative_url }}">
        <span>Suivant</span>
        {{ next_item.title }}
      </a>
    {% endif %}
  </nav>
{% endif %}