site/_src/_includes/testimonials.html

<article class="testimonials grid grid--full grid-medium--fit grid--gutters">

    {% for testimonial in site.data.testimonials %}

    <div class="grid__col">
        <figure class="testimonial">

            <blockquote class="testimonial__quote">{{ testimonial.quote }}</blockquote>

            <div class="testimonial__image">
                <img class="testimonial__avatar" src="/assets/img/{{ testimonial.image }}">
            </div>

            <figcaption class="testimonial__caption">
                {{ testimonial.name }} &bull; &bull; {{ testimonial.org }}
            </figcaption>
        </figure>
    </div>

    {% endfor %}

</article>