title: Laravel-MIX: Remove unused files after combine/merge
body: <p>I am new at <code>Laravel-mix</code> and <code>webpack</code>. After some practice I was able to combining css and js files into 1 single file respectively. However, after the combine the other files are still there, which are of no use to the application.</p>
  
  <p><strong>For example:</strong></p>
  
  <pre><code>resources
  |-- scss
    |-- font-awesome.scss
    |-- template.scss
  
  public
  |-- css
    |-- font-awesome.css
    |-- template.css
  </code></pre>
  
  <p><strong>After combining:</strong></p>
  
  <pre><code>public
  |-- css
    |-- font-awesome.css
    |-- template.css
    |-- combined.min.css (font-awesome.css + template.css = combined.min.css)
  </code></pre>
  
  <p><strong>Webpack</strong></p>
  
  <pre><code>mix
      .sass('resources/sass/font-awesome.scss', 'public/css/font-awesome.css')
      .sass('resources/sass/template.scss', 'public/css/template.css');
  
  // combining css files
  mix.combine([
      'public/css/font-awesome.css',
      'public/css/template.css'
  ], 'public/css/combined.min.css');
  </code></pre>
  
  <p>As the <code>font-awesome.css</code> &amp; <code>template.css</code> files are combined into <code>combined.min.css</code>, there is no need for them anymore, same goes for the <code>javascript</code> files.</p>
  
  <p>How to remove these useless files, is this possible..?</p>