codeninjasuk.github.io/_includes/category-list.html

{% case site.category_archive.type %}
  {% when "liquid" %}
    {% assign path_type = "#" %}
  {% when "jekyll-archives" %}
    {% assign path_type = nil %}
{% endcase %}

{% if site.category_archive.path %}
  {% assign categories_sorted = page.categories | sort_natural %}

  <p class="page__taxonomy">
    <strong><i class="fas fa-fw fa-folder-open" aria-hidden="true"></i> {{ site.data.ui-text[site.locale].categories_label | default: "Categories:" }} </strong>
    <span itemprop="keywords">
    {% for category_word in categories_sorted %}
      <a href="{{ category_word | slugify | prepend: path_type | prepend: site.category_archive.path | relative_url }}" class="page__taxonomy-item p-category" rel="tag">{{ category_word }}</a>{% unless forloop.last %}<span class="sep">, </span>{% endunless %}
    {% endfor %}
    </span>
  </p>
{% endif %}