hello-world example should direct users on how to fulfill prerequisites

[tstromberg]

If you stumble into https://docs.tinkerbell.org/workflows/hello-world-workflow/ the wrong way, you will get very confused as it assumes knowledge of the provisioner & worker, and that it is already setup. We provide no guidance to users who do not meet the prerequisites.

As there is already a lot of new terminology for users sort out, we can reduce the cognitive overhead of learning Tinkerbell through copious use of hyperlinks.

My thoughts lean something toward:

## A Hello-World Workflow

The "Hello World" example uses an example <a href="?">hardware data</a>, <a href="?"> template</a>, and <a href="?">workflow</a> to show off some basic Tinkerbell functionality, and the interaction between a <a href="?">Provisioner</a> and a <a href="?">Worker</a>. It uses the hello-world docker image as an example task that could be performed on a Worker as part of a workflow.

Prerequisites

This tutorial assumes that you already Tinkerbell up and running. If you do not yet, please check-out our <a href="?>Getting Started guide.

This tutorial also assumes that you have a Worker that has not yet been brought up, or can be restarted.

[tstromberg]

This should be an easy quality of life improvement to make. Any volunteers?

[jacobweinstock]

this example section has been removed.