Update README.md

We want the copyable commands in the README to be drop-in; we have one that starts with the `$` to indicate the command should be entered into a shell, but this should be self-explanatory to the audience of this doc.

If they click the copy button this text is noise that will require them to edit the string before running it in the terminal.

.github/README.md

@@ -29,7 +29,7 @@ On a mac you can easily install these prerequisites with: `brew install minikube
 - Set up [Minikube](https://minikube.sigs.k8s.io/docs/)
 
 ```
-$ helm install --namespace kube-system nginx ingress-nginx --repo https://kubernetes.github.io/ingress-nginx
+helm install --namespace kube-system nginx ingress-nginx --repo https://kubernetes.github.io/ingress-nginx
 ```
 
 ## Fast Track Startup