feat(installing-workflow): add ELB install notes

Many users have missed this step, causing errors to pop up when
pushing to their cluster. This makes it so it is more apparent
that this is an important step in the setup process.

Author: Matthew Fisher

src/installing-workflow/installing-deis-workflow.md

@@ -65,8 +65,17 @@ $ kubectl get pods --namespace=deis -w
 
 Once you see all of the pods in the `READY` state, Deis Workflow is up and running!
 
+## Configure your Load Balancer
+
+After installing Workflow on your cluster, you'll need to [configure your load balancer][lb].
+Following this step is especially important on AWS because the default idle timeout for connections
+on the Elastic Load Balancer is too low for the [Builder][] to finish a `git push` operation.
+
 Next, [configure dns][] so you can register your first user.
 
+
+[builder]: ../understanding-workflow/components.md#builder-builder-slugbuilder-and-dockerbuilder
+[configure dns]: ../managing-workflow/configuring-dns.md
 [helm]: http://helm.sh
+[lb]: ../managing-workflow/configuring-load-balancers.md
 [using deis]: ../using-workflow/deploying-an-application.md
-[configure dns]: ../managing-workflow/configuring-dns.md