Add ad slide

assets/style/main.scss

@@ -50,16 +50,22 @@ li {
   ul {
     display: inline-block;
     width: 40%;
-    .page-1 &, .page-2 &, .page-12 & {
+    .page-2 &, .page-3 &, .page-13 & {
       width: auto;
     }
   }
 
+  h2 {
+    .page-6 &{
+      margin: 1em 0;
+    }
+  }
+
   pre, code {
     margin: 0;
     overflow: visible;
 
-    .page-25 & , .page-28 & {
+    .page-26 & , .page-29 & {
       font-size: 0.80em;
     }
   }
@@ -68,5 +74,8 @@ li {
     display: block;
     margin: 0 auto;
     width: $slide-width;
+    .page-1 & {
+      width: 882px;
+    }
   }
 }

data/slide/010-ad.md

@@ -0,0 +1 @@
+![Node AD](/static/images/js-and-node-ad.png "Node")