Merge pull request #40 from plotly/replace-homepage-hero

replace homepage hero image

Author: Joseph Damiba

_posts/2015-07-26-index.html

@@ -17,6 +17,7 @@
 {% include layouts/_header-main.html %}
 
 <main class="page --home --api">
+    <img style="width: 100%;" src="/all_static/images/header_graphing library.png"/>
     <div class="--wrap-top">
         <section class="hero">
             <div class="--wrap-inner">