Expanded the demo page for powershell and included the mode in the build.

demo/docs/powershell.ps1

@@ -1,5 +1,15 @@
-
 # This is a simple comment
 function Hello($name) {
-  Write-host "Hellot $name"
+  Write-host "Hello $name"
 }
+
+$number = 1 + 2;
+$number += 3
+
+Write-Host Hello -name "World"
+
+$an_array = @(1, 2, 3)
+$a_hash = @{"something" = "something else"}
+
+& notepad .\readme.md
+