Update oneshot installation to clone repository locally

- Modified install.ps1 to clone git-workshop repository to ~/git-workshop
- Added option to remove existing directory before cloning
- Updated documentation to reflect the new behavior
- Now provides complete setup: install tools + clone repo in one command
- Similar to Scoop's get.scoop.sh installation pattern

install.ps1

@@ -197,6 +197,38 @@ catch {
     Write-Host "  You can manually delete: $tempDir" -ForegroundColor Yellow
 }
 
+# Clone the repository locally
+Write-Step "Cloning Git Workshop Repository"
+
+$cloneDir = Join-Path $HOME "git-workshop"
+
+try {
+    if (Test-Path $cloneDir) {
+        Write-Warning "Directory already exists: $cloneDir"
+        $response = Read-Host "  Do you want to remove it and clone fresh? (y/n)"
+        if ($response.Trim().ToLower() -eq 'y' -or $response.Trim().ToLower() -eq 'yes') {
+            Remove-Item -Path $cloneDir -Recurse -Force
+            Write-Host "  Removed existing directory" -ForegroundColor Gray
+        }
+        else {
+            Write-Host "  Skipping clone - using existing directory" -ForegroundColor Gray
+        }
+    }
+    
+    if (-not (Test-Path $cloneDir)) {
+        Write-Host "  Cloning to: $cloneDir" -ForegroundColor Gray
+        git clone "https://git.frod.dk/floppydiscen/git-workshop.git" $cloneDir
+        Write-Success "Repository cloned successfully!"
+    }
+}
+catch {
+    Write-Error "Failed to clone repository: $_"
+    Write-Host ""
+    Write-Host "You can clone manually:" -ForegroundColor Yellow
+    Write-Host "  git clone https://git.frod.dk/floppydiscen/git-workshop.git ~/git-workshop" -ForegroundColor White
+    exit 1
+}
+
 # Final instructions
 Write-Step "Installation Complete"
 
@@ -204,11 +236,17 @@ Write-Host ""
 Write-Success "Git Workshop installation is complete!"
 Write-Host ""
 
+Write-Host "Repository cloned to: $cloneDir" -ForegroundColor Green
+Write-Host ""
+
 Write-Host "Next steps:" -ForegroundColor Cyan
-Write-Host "  1. Clone or download the Git Workshop repository" -ForegroundColor White
-Write-Host "  2. Configure Git if you haven't already:" -ForegroundColor White
+Write-Host "  1. Configure Git if you haven't already:" -ForegroundColor White
 Write-Host "     git config --global user.name `"Your Name`"" -ForegroundColor Gray
 Write-Host "     git config --global user.email `"your.email@example.com`"" -ForegroundColor Gray
+Write-Host ""
+Write-Host "  2. Navigate to the workshop:" -ForegroundColor White
+Write-Host "     cd $cloneDir" -ForegroundColor Gray
+Write-Host ""
 Write-Host "  3. Start with the first module:" -ForegroundColor White
 Write-Host "     cd 01-essentials\01-basics" -ForegroundColor Gray
 Write-Host "     .\setup.ps1" -ForegroundColor Gray