Adding stick, featured articles to a Shopify blog

sticky-blog.liquid

<div class="blog-main">
  {% comment %} Get all the articles for the blog {% endcomment %}
  {% assign all_articles = blog.articles %}
  {% assign posts_per_page = section.settings.posts_per_page %}
  {% assign feature_article_1 = articles[section.settings.feature_article_1] %}
  
  {% comment %}
    Start pagination as you normally would. This is to be sure the correct
    page nav links show up without having to modify anything about them.
  {% endcomment %}
  {% paginate blog.articles by posts_per_page %}
    
    {% comment %} 
     Using the page number multiplied by the post per page we figure out
     the upper and lower limits of blog article indexes that will be shown for that page.
    {% endcomment %}
    {% assign current_page = paginate.current_page %}
    {% assign lower_limit = current_page | minus: 1 | times: posts_per_page %}
    {% assign top_limit = lower_limit | plus: posts_per_page %}

    {% comment %} Start a counter for blog articles {% endcomment %}
    {% assign index = 0 %}

  <div class="blog-content">

      {% comment %}
        If we have a feature article, increase the index to offset the article's position in 
        the all_articles array
      {% endcomment %}
      {% if feature_article_1 %}
        {% assign index = index | plus: 1 %}
        {% if current_page == 1 %}
          {% include 'post-tile' with {
            article: feature_article_1
          } %}
        {% endif %}
      {% endif %}
      
      {% comment %} Loop through all the blog articles rather than the pagination articles {% endcomment %}
      {% for article in all_articles %}

        {% comment %}
         If the article's index is within the pagination limits and not a feature article display it
        {% endcomment %}
        {% if index >= lower_limit and index < top_limit %}
          {% if feature_article_1.id != article.id %}
            {% include 'post-tile' with {
              article: article
            } %}
          {% endif %}
        {% endif %}

        {% comment %}
          Increase the counter for articles that aren't the feature article
        {% endcomment %}
        {% if feature_article_1.id != article.id %}
          {% assign index = index | plus: 1 %}
        {% endif %}
      {% endfor %}

  </div>

  {% comment %} Add regular pagination {% endcomment %}
  {% include 'pagination' %}

  {% endpaginate %}

</div>