adapt landing page to docsy changes (#227)

Author: lyind

content/_index.html

@@ -12,7 +12,7 @@
 </div>
 {{< /blocks/cover >}}
 
-{{< blocks/section color="white" type="container mx-auto" >}}
+{{< blocks/section color="white" type="row" >}}
   <div class="col-sm text-center">
     <a class="btn-dark btn-lg mr-3 mb-4" href="https://blog.giantswarm.io/">
       Blog