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/plugins/post_social_plugins.html

@@ -0,0 +1,34 @@
+<div class="postSocialPlugins">
+  <a
+    href="https://twitter.com/share"
+    class="twitter-share-button"
+    data-url="{{ page.url | replace:'index.html','' | absolute_url }}"
+    data-text="{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}"
+    data-hashtags="flowtype">Tweet</a>
+  <div
+    class="fb-like"
+    data-href="{{ page.url | replace:'index.html','' | absolute_url }}"
+    data-layout="button_count"
+    data-action="like"
+    data-show-faces="false"
+    data-share="true"></div>
+</div>
+<script>
+  window.fbAsyncInit = function() {
+  FB.init({
+    appId      : '{{ site.fbappid }}',
+    xfbml      : true,
+    version    : 'v2.2'
+  });
+  };
+
+  (function(d, s, id){
+   var js, fjs = d.getElementsByTagName(s)[0];
+   if (d.getElementById(id)) {return;}
+   js = d.createElement(s); js.id = id;
+   js.src = "//connect.facebook.net/en_US/sdk.js";
+   fjs.parentNode.insertBefore(js, fjs);
+   }(document, 'script', 'facebook-jssdk'));
+</script>
+
+<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script>