Fix a forgotten npm reference

src/command-line/index.js

@@ -29,7 +29,7 @@ if (!fs.existsSync(path.join(
 	"public",
 	"manifest.json"
 ))) {
-	log.error(`The client application was not built. Run ${colors.bold("NODE_ENV=production npm run build")} to resolve this.`);
+	log.error(`The client application was not built. Run ${colors.bold("NODE_ENV=production yarn build")} to resolve this.`);
 	process.exit(1);
 }
 

webpack.config.js

@@ -4,10 +4,6 @@ const webpack = require("webpack");
 const path = require("path");
 const CopyPlugin = require("copy-webpack-plugin");
 
-// ********************
-// Common configuration
-// ********************
-
 const config = {
 	mode: process.env.NODE_ENV === "production" ? "production" : "development",
 	entry: {