Simplified Windows PowerShell bootstrap instructions

Simplified Windows PowerShell bootstrap instructions and removed the bit about not running it in an elevated session as that does not matter when using the new technique
Used the same verbiage for all three platforms to describe what changes need to be made to config.properties

Readme.MD

@@ -26,27 +26,32 @@ This tool has been verified to work on macOS Sierra, High Sierra, Windows Server
 
 ### Windows
 
-1. Copy the following PowerShell bootstrap script into your clipboard:
- ```powershell
- Invoke-RestMethod https://raw.githubusercontent.com/oktadeveloper/okta-aws-cli-assume-role/master/bin/Install-OktaAwsCli.ps1 | clip.exe
+1. Run the following in a [PowerShell console](http:https://technet.microsoft.com/library/hh831491.aspx#start-windows-powershell)
+ ```pwsh
+ Set-ExecutionPolicy -Scope Process -ExecutionPolicy unrestricted -Force; Invoke-Expression ((New-Object Net.WebClient).DownloadString('https://raw.githubusercontent.com/oktadeveloper/okta-aws-cli-assume-role/master/bin/Install-OktaAwsCli.ps1')); .$profile
  ```
-2. Open a PowerShell console (regular user, NOT admin it will break)
-3. Right-click once the paste the bootstrap script into the session
-4. Right-click a second time to paste and run the install script
-5. Customize **%userprofile%\\.okta\\config.properties** to reflect your Okta and Amazon Web Services setup
+2. Customize **%userprofile%\\.okta\\config.properties** and set **OKTA_ORG** and **OKTA_AWS_APP_URL** appropriately. For example,
+ ```properties
+ OKTA_ORG=acmecorp.oktapreview.com
+ OKTA_AWS_APP_URL=https://acmecorp.oktapreview.com/home/amazon_aws/0oa5zrwfs815KJmVF0h7/137
+ ```
 
 ### macOS/Linux
 
 1. Run the following in a Terminal:
  ```bash
  curl 'https://raw.githubusercontent.com/oktadeveloper/okta-aws-cli-assume-role/master/bin/install.sh' | bash
  ```
-2. Customize **~/.okta/config.properties** to reflect your Okta and Amazon Web Services setup
+2. Customize **~/.okta/config.properties** and set **OKTA_ORG** and **OKTA_AWS_APP_URL** appropriately. For example,
+
+ ```properties
+ OKTA_ORG=acmecorp.oktapreview.com
+ OKTA_AWS_APP_URL=https://acmecorp.oktapreview.com/home/amazon_aws/0oa5zrwfs815KJmVF0h7/137
+ ```
 
 ### Docker
 
-1. Copy `config.properties` to `~/.okta/config.properties` and set
- **OKTA_ORG** and **OKTA_AWS_APP_URL** appropriately. For example,
+1. Copy `config.properties` to `~/.okta/config.properties` and set **OKTA_ORG** and **OKTA_AWS_APP_URL** appropriately. For example,
 
  ```properties
  OKTA_ORG=acmecorp.oktapreview.com