Update wording of the README file

This file is used for assignment0 of the Pilot Node Curriculum. It is also needed for contributors to the curriculum. (See this CONTRIBUTING file.)

Some aspects of it benefit from slight formatting changes. For example from

Welcome to Code the Dream’s Node/Express class! You will be learning Node.js, an implementation of the JavaScript engine that runs standalone or as a web server. This page describes how to begin. You can develop Node applications on MacOS, Linux, or Windows. If you are developing on Windows, there is no need to do development in a virtual machine, as Node development works fine in Windows native environments, but you can use the Windows Subsystem for Linux if you prefer. You will need to install:

to

Welcome to Code the Dream’s Node/Express class! You will be learning Node.js, an implementation of the JavaScript engine that runs standalone or as a web server. This page describes how to begin and should be closely followed to get your work environment set up properly. You can develop Node applications on MacOS, Linux, or Windows. If you are developing on Windows, there is no need to do development in a virtual machine, as Node development works fine in Windows native environments, but you can use the Windows Subsystem for Linux if you prefer. You will need to install:

Follow each section below to properly install the software you'll need for this course.

Open the README referenced by the issue and compare the introductory wording with the proposed replacement. Update the formatting and wording shown in the issue, then verify that the rendered Markdown clearly presents the setup instructions for contributors.