new accordion feature

_includes/accordion.html

+<style>
+ul.jekyllcodex_accordion {position: relative; margin: 1.4rem 0!important; padding-bottom: 0;}
+ul.jekyllcodex_accordion > li {border-bottom: 1px solid rgba(0,0,0,0.25); list-style: none; margin-left: 0;}
+ul.jekyllcodex_accordion > li > input {display: none;}
+ul.jekyllcodex_accordion > li > label {display: block; cursor: pointer; padding: 0.75rem 2.4rem 0.75rem 0; margin: 0;}
+ul.jekyllcodex_accordion > li > div {display: none; padding-bottom: 1.2rem;}
+ul.jekyllcodex_accordion > li > input:checked + label {font-weight: bold;}
+ul.jekyllcodex_accordion > li > input:checked + label + div {display: block;}
+ul.jekyllcodex_accordion > li > label::before {content: "\e802"; font-weight: normal; position: absolute; right: 1rem; margin: 1rem 1rem 0 0; font-family: "fontello";}
+ul.jekyllcodex_accordion > li > input:checked + label::before {transform: rotate(90deg);}
+ul.jekyllcodex_accordion > li > div > ul > li {list-style: disc;}
+
+</style>
+<ul class="jekyllcodex_accordion">
+    {% for item in include.accordion %}
+     {% if item.checked %}
+        <li><input id="accordion{{ include.id | append: forloop.index }}" type="checkbox" checked=checked/><label for="accordion{{ include.id | append: forloop.index }}"><h2>{{ item.title }}</h2></label>
+        	<div>
+        	{% if item.img %}
+        		{% include image src=item.img style=item.style %}
+            {% else %}
+        		{{ item.content | markdownify }}
+        	 {% endif %}
+        	</div>
+        </li>
+     {% else %}
+        <li><input id="accordion{{ include.id | append: forloop.index  }}" type="checkbox" /><label for="accordion{{ include.id | append: forloop.index  }}"><h2>{{ item.title }}</h2></label>
+        	<div>
+        	{% if item.img %}
+        		{% include image src=item.img style=item.style %}
+            {% else %}
+        		{{ item.content | markdownify }}
+        	 {% endif %}
+        	</div>
+        </li>
+    {% endif %}
+    {% endfor %}
+</ul>
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