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

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

luacs-docs/lua/scripts/serve.ps1

@@ -0,0 +1,14 @@
+Import-Module $PSScriptRoot/../../scripts/location.ps1
+
+try {
+  Change-Location $PSScriptRoot/..
+
+  if ((Get-Command "python3" -ErrorAction SilentlyContinue) -eq $null) {
+    echo "python3 not found"
+    exit 1
+  }
+
+  python3 ../scripts/http_server.py ./build --port 8000
+} finally {
+  Restore-Location
+}