Move docs to luacs-docs/{lua,cs,landing-page}

luacs-docs/cs also has a proper http server for testing locally

luacs-docs/scripts/location.ps1

@@ -0,0 +1,14 @@
+[System.Collections.ArrayList]$Locations = @()
+
+function Change-Location($path) {
+  $loc = Get-Location
+  $Locations.Add($loc)
+  Set-Location $path
+}
+
+function Restore-Location {
+  $idx = $Locations.Count - 1
+  $loc = $Locations[$idx]
+  $Locations.RemoveAt($idx)
+  Set-Location $loc
+}