add darkmode, minimize js/css

project/webpack.config.js

@@ -72,6 +72,14 @@ Encore
 
     // uncomment if you're having problems with a jQuery plugin
     //.autoProvidejQuery()
+    .configureTerserPlugin(options => {
+        options.terserOptions = {
+            output: {
+                comments: false
+            },
+            sourceMap: true
+        }
+    })
 ;
 
 module.exports = Encore.getWebpackConfig();