Add DSC configurations for user interface, Windows features, and services; implement app installation and removal scripts

- Created `DSC-UserInterfaceConfiguration.ps1` to manage user interface settings via registry changes.
- Developed `DSC-WindowsFeatures.ps1` to install OpenSSH Client and enable NFS Client features.
- Implemented `DSC-WindowsServices.ps1` to ensure Terminal Services are running and set to automatic startup.
- Added `PS-InstallApps.ps1` to manage app installations and remove the msstore source if it exists.
- Created `PS-RemoveApps.ps1` to remove unwanted apps, provisioned packages, and handle Office applications via winget.

PS-InstallApps.ps1

@@ -0,0 +1,13 @@
+# Check if msstore source exists before trying to remove it
+$msstoreSource = winget source list | Select-String "msstore"
+if ($msstoreSource) {
+    Write-Host "Removing msstore source..." -ForegroundColor Yellow
+    winget source remove msstore
+} else {
+    Write-Host "msstore source is already removed or not found." -ForegroundColor Green
+}
+
+winget import -i .\winget.json
+winget pin add Discord.Discord
+winget pin add Brave.Brave
+