refactor: rewrite the merge-revert section

It is an advanced and difficult revert to accomplish and should probably
be done through a reset instead, which means that we're modifying
history which is dangerous and so should be handled by someone who
understands these dangers.

01-essentials/06-revert/reset.ps1

@@ -1,14 +1,14 @@
 #!/usr/bin/env pwsh
 <#
 .SYNOPSIS
-    Resets the Module 05 challenge environment to start fresh.
+    Resets the Module 06 challenge environment to start fresh.
 
 .DESCRIPTION
     This script removes the challenge directory and re-runs setup.ps1
     to create a fresh challenge environment.
 #>
 
-Write-Host "`n=== Resetting Module 05: Git Revert Challenge ===" -ForegroundColor Cyan
+Write-Host "`n=== Resetting Module 06: Git Revert Challenge ===" -ForegroundColor Cyan
 
 # Check if challenge directory exists
 if (Test-Path "challenge") {