{% if include.href %}
  {% assign href = include.href %}
{% else %}
  {% capture href %}{{ site.baseurl }}/static/img/{{ include.src }}{% endcapture %}
{% endif %}

<a href="{{ href }}" target="_blank">
  <img class="img-responsive" {% if include.width %} width="{{include.width}}" {% endif %} src="{{ site.baseurl }}/static/img/{{ include.src }}" alt="{{ include.alt }}" />
</a>