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/nav_search.html

@@ -0,0 +1,15 @@
+<li class="navSearchWrapper">
+  <input id="{{ include.inputselector }}" type="search" />
+</li>
+<script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script>
+<script>
+// For Algolia search
+(function() {
+  // Algolia
+  docsearch({
+    apiKey: '{{ site.searchconfig.apikey }}',
+    indexName: '{{ site.searchconfig.indexname }}',
+    inputSelector: '#{{ include.inputselector }}',
+  });
+}());
+</script>