Fix image layout on the Samza homepage. Adjust a few pixels

Author: Jagadish <jvenkatraman@linkedin.com>

Reviewers: Jagadish<jagadish@apache.org>

Closes apache#698 from vjagadish1989/website-reorg6

Author: jagadish-v0

docs/_layouts/default.html

@@ -117,7 +117,7 @@ <h3>Latest from our blog</h3>
       </p>
 
       <!-- <img src="/img/latest/learn/documentation/api/samza-arch3.png"> -->
-      <img src="/img/latest/learn/documentation/api/samza-arch6.png" width="50%" height="50%" hspace="30px">
+      <img src="/img/latest/learn/documentation/api/samza-arch4.png" width="44.7%" height="50%" hspace="25px">
   </div>
   </div>