Add she-bang to all files

scripts/Windows/Scripts/Context.ps1

@@ -1,3 +1,4 @@
+#!/bin/pwsh
 class Context {
     [string]$EntryPoint;
     [string]$RootDir;

scripts/Windows/Scripts/PersonalFiles.ps1

@@ -1,3 +1,4 @@
+#!/bin/pwsh
 . "$PSScriptRoot/Context.ps1";
 
 function Get-BackupCandidates() {

scripts/Windows/Scripts/Prerequisites.ps1

@@ -1,3 +1,4 @@
+#!/bin/pwsh
 foreach ($module in @("PSWindowsUpdate", "KnownFolders"))
 {
     if (-not (Get-Module -ListAvailable $module))