Allow simple build

scripts/build.ps1

@@ -1,3 +1,10 @@
+param (
+    # Clean files and run webpack only.
+    [Parameter()]
+    [switch]
+    $Simple
+)
+
 # Clean files
 if (Test-Path ./public/app) {
     Remove-Item ./public/app -Recurse -Force
@@ -6,6 +13,10 @@ if (Test-Path ./public/app) {
 # Run webpack
 yarn build
 
+if ($Simple) {
+    exit
+}
+
 # Copy static files
 Copy-Item -Path ./resources/assets/src/images/bg.jpg -Destination ./public/app
 Copy-Item -Path ./resources/assets/src/images/favicon.ico -Destination ./public/app