Updates documentation screenshots and UI descriptions

Refreshes numerous screenshot image references across the documentation to reflect the latest UI changes. Updates text descriptions in several documents (Build, Prerequisites, Quickstart, Windows Settings) to align with recent features, such as the new Windows Media Source options, explicitly mentioning PowerShell 7.6+ requirements, and clarifying the Device Naming and Copy Unattend.xml behavior.

Co-authored-by: Copilot <copilot@github.com>

docs/prerequisites.md

@@ -26,7 +26,7 @@ Follow the guide linked below to install Hyper-V on Windows client or Server
 
 ## Install PowerShell 7
 
-PowerShell 7 is required as of releases 2507+ onward.
+PowerShell 7.6+ is required as of releases 2507+ onward.
 
 [Installing PowerShell on Windows - PowerShell \| Microsoft Learn
 ](https://learn.microsoft.com/en-us/powershell/scripting/install/installing-powershell-on-windows)
@@ -57,10 +57,10 @@ Replace `C:\FFUDevelopment` with the path you extracted the files to.
 
 ## Running BuildFFUVM_UI.ps1
 
-Either run Terminal as Admin, making sure to select PowerShell, not Windows PowerShell, or PowerShell 7.5+ as Admin and run `C:\FFUDevelopment\BuildFFUVM_UI.ps1`
+Either run Terminal as Admin, making sure to select PowerShell, not Windows PowerShell, or PowerShell 7.6+ as Admin and run `C:\FFUDevelopment\BuildFFUVM_UI.ps1`
 
 If all went well, you should see the FFU Builder UI
 
-![1759527337644](image/Prerequisites/1759527337644.png)
+![1776376971272](image/prerequisites/1776376971272.png)
 
 {% include page_nav.html %}