Clean up build

Author: Ives van Hoorne

packages/sandpack/gulpfile.js

@@ -1,5 +1,12 @@
 const gulp = require('gulp');
 
 gulp.task('copy-sandbox', () =>
-  gulp.src('../app/www/**/*.*').pipe(gulp.dest('./sandpack/'))
+  gulp
+    .src([
+      '../app/www/**/*.*',
+      '!../app/www/**/*.map',
+      '!../app/www/stats.json',
+      '!../app/www/public/**/*.*',
+    ])
+    .pipe(gulp.dest('./sandpack/'))
 );