Delete assets/resized directory from GIT (#440)

.gitignore

@@ -8,3 +8,4 @@ _site
 .tweet-cache
 Gemfile.lock
 vendor
+

_includes/responsive_img.html

@@ -1,6 +0,0 @@
-<picture>
-    {% for i in resized %}
-    <source media="(max-width: {{ i.width }}px)" srcset="{{ i.path | relative_url }}">
-    {% endfor %}
-    <img {% if class %}class="{{ class }}"{% endif %} src="{{ path | relative_url }}" {% if alt %}alt="{{ alt }}"{% endif %} {% if title %}title="{{ title }}"{% endif %} {% if zoomable %}data-zoomable{% endif %} />
-</picture>