refactor: Refactor webpack config and asset handling

- Improve webpack performance and configuration
- Delete unnecessary CSS and binary files
- Adjust ESLint ignored files list
- Update package.json with webpack mode for dev and prod scripts
- Move app.css to app.js in master.blade.php

.eslintrc.yml

@@ -4,6 +4,8 @@ extends: 'eslint:recommended'
 env:
   browser: true
   es6: true
+ignorePatterns:
+  - webpack.config.js
 rules:
   indent:
     - error