Update the homepage

Author: mrmrs

src/templates/index.html

@@ -75,15 +75,15 @@ <h1 class="mtn f4 ttu tracked">Getting Started</h1>
 npm install &amp;&amp; npm start
 </code></pre>
   <section class="bt b--black-10 pv5 mt5 cf">
-    <div class="fl-ns w-100 w-50-ns pr3-ns">
+    <div class="fl-l w-100 w-50-l pr3-l">
       <h3 class="mtn f3 mt0">Start a New Project</h3>
       <p class="f4 measure lh-copy mb4 mt0">
         Get setup and running with this ~7 minute screencast. Download the
         project and learn how to customize the tachyons source files and
         recompile the css using the postcss build system.
       </p>
     </div>
-    <div class="fl-ns w-100 w-50-ns">
+    <div class="fl-l w-100 w-50-l">
       <div class="aspect-ratio aspect-ratio--16x9">
         <iframe class="aspect-ratio--object" src="https://player.vimeo.com/video/174698456" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
       </div>