Customizing the Windows 8.1 Start Screen
Removing Built-in Applications from Windows 8.1
This procedure only works when you are building your Reference Golden Image. The appx are removed and will not be installed for all new users who login in.
If you want to remove all of the built-in applications then you can use the following simple PowerShell commands:
Get-AppXProvisionedPackage -online | Remove-AppxProvisionedPackage –online
Get-AppXPackage | Remove-AppxPackage
Once the apps are removed and the start screen is configured the way you want see my post on Exporting the layout and importing using powershell here.