<!--
My images are in a assets/images/slider directory.
-->
{% for image in site.static_files %}
{% if image.path contains 'images/slider' %}
<img src="{{ site.baseurl }}{{ image.path }}" alt="image" />
{% endif %}
{% endfor %}
<!--
The image.path contains 'images/slider' makes sure that only images in that folder are inserted.
-->
<!--
Listing the jpg files in the current directory in Jekyll can also be done like this:
-->
{% for file in site.static_files %}
{% assign pageurl = page.url | replace: 'index.html', '' %}
{% if file.path contains pageurl %}
{% if file.extname == '.jpg' or file.extname == '.jpeg' or file.extname == '.JPG' or file.extname == '.JPEG' %}
<img src="{{ file.path }}" />
{% endif %}
{% endif %}
{% endfor %}