Shippable instructions out of date

[pjlewisuk]

It looks like shippable has had a significant UI and UX overhaul since these instructions were written, so it's pretty difficult to follow the instructions now. There are steps where it's difficult to figure out what to do next (e.g. "Select your Subscription from the drop-down menu (three horizontal lines) in upper left" from https://microservices-demo.github.io/deployment/ecs-weave-shippable.html), and others where shippable asks for input parameters that aren't defined in the instructions (e.g. under "Configure an integration between Shippable and Amazon ECR" on https://microservices-demo.github.io/deployment/ecs-weave-shippable.html).