Documentation Improvements for Windows + PowerShell

[JosephSemrai]

Prerequisites

• I am running the latest version
• I checked to make sure that this issue has not already been filed

Expected Behavior

1. By default, whether using Anaconda or some other installation of Python, virtualenv should be started with a reference to python rather than python3. An update to the documentation or a separate section containing this improvement + the one below opens the project to easier contribution.
2. The starting documentation should provide different instructions (open the ps1 script, not bat) if the user is using PowerShell for clarity with regard to setting up virtualenv.
   For example, under the current documentation, the file referenced will not work at all using PowerShell or the Visual Studio Code Integrated Terminal. A reference or note mentioning this would ease the cloning of the project dramatically while also presenting a standardized setup process for those using PowerShell.
   

Current Behavior

The documentation does not highlight this behavior and targets the following file:

Given permission, I'd like to open a pull request addressing this in the documentation.