adding the masthead.

docs/_includes/masthead.html

@@ -0,0 +1,19 @@
+<header class="docs-masthead clearfix">
+  <div class="container">
+    <div class="column units-2">
+      <h1 class="docs-title">
+        <a href="/" data-ignore="push">Ratchet</a>
+      </h1>
+      <nav class="docs-nav clearfix">
+        <a class="docs-nav-trigger icon icon-bars pull-right js-docs-nav-trigger" href="#"></a>
+        <div class="docs-nav-group">
+          <a class="docs-nav-item" href="/" data-ignore="push">Home</a>
+          <a class="docs-nav-item" href="/getting-started" data-ignore="push">Getting started</a>
+          <a class="docs-nav-item" href="/components" data-ignore="push">Components</a>
+          <a class="docs-nav-item" href="/examples" data-ignore="push">Examples</a>
+          <a class="docs-nav-item" href="/about" data-ignore="push">About</a>
+        </div>
+      </nav>
+    </div>
+  </div>
+</header>