Decide on best way to run OPA for docs

[anderseknert]

While ngrok works great for local testing, we'll not want to depend on a proprietary third-party service for the OPA docs. It would be good if we, as part of the docs, set up OPA either running as a container in something like ECS, or as a Lambda. We'll also want to run this so that it uses the management APIs like how we do it in the other tutorials.

[anderseknert]

Since I think it's fair to assume cloudformation knowledge, we should use a cloudformation template to deploy the components necessary to run OPA, whether we use ECS, Lambdas or something else.