Massive cleanup

- Simpler main nav on all pages
- Back to purple masthead on homepage instead of dark graphite
- Active link styles on the main nav
- Cleaned up sidebar nav
- New docs layout name
- Homepage copy edits
- Updated bright purple docs color

docs/_layouts/simple.html

@@ -2,8 +2,16 @@
 layout: default
 ---
 
+<div class="bd-pageheader text-xs-center text-sm-left">
+  <div class="container">
+    <h1>{{ page.title }}</h1>
+    <p class="lead">
+      Quickly get a project started with any of our examples ranging from using parts of the framework to custom components and layouts.
+    </p>
+    {% include ads.html %}
+  </div>
+</div>
+
 <div class="container bd-content">
-  {% include ads.html %}
-  <h1 class="bd-title">{{ page.title }}</h1>
   {{ content }}
 </div>