Move yoga docs into docs folder on master branch

Summary: Move yoga docs into master branch so that pull requests are able to include doc updates as part of other changes.

Reviewed By: JoelMarcey

Differential Revision: D4365700

fbshipit-source-id: 2f46a88974104c454c00bcdf1257abb5c4075a68

docs/_includes/content/items/gridblock.html

@@ -0,0 +1,37 @@
+{% if include.layout == "fourColumn" %}
+  {% assign layout = "fourByGridBlock" %}
+{% else %}
+  {% assign layout = "twoByGridBlock" %}
+{% endif %}
+
+{% if include.imagealign == "side" %}
+  {% assign imagealign = "imageAlignSide" %}
+{% else %}
+  {% if item.image %}
+    {% assign imagealign = "imageAlignTop" %}
+  {% else %}
+    {% assign imagealign = "" %}
+  {% endif %}
+{% endif %}
+
+{% if include.align == "right" %}
+  {% assign align = "alignRight" %}
+{% elsif include.align == "center" %}
+  {% assign align = "alignCenter" %}
+{% else %}
+  {% assign align = "alignLeft" %}
+{% endif %}
+
+<div class="blockElement {{ layout }} {{ imagealign }} {{ align }}">
+  {% if item.image %}
+  <div class="blockImage">
+    <img src="/static/{{ item.image }}" alt="{{ item.title }}" title="{{ item.title }}" />
+  </div>
+  {% endif %}
+  <div class="blockContent">
+    <h3>{{ item.title }}</h3>
+    {% if item.text %}
+    {{ item.text | markdownify }}
+    {% endif %}
+  </div>
+</div>