title: Relative path(in CSS file) in Laravel mix
body: <p>I have following file structure:</p>
  <p><strong>File structure</strong></p>
  <pre><code>example/
  ├── public/
  │   ├── css
  │   │     └── home
  │   │         ├── app.css
  │   │         └── app.css.map
  │   ├── images
  │   │   ├── a.jpg
  │   │   └── b.jpg
  └── resources/
      ├── scss
      │   ├── app.scss
      │   └── ....
      └── images
          ├── a.jpg
          └── b.jpg
  </code></pre>
  <pre class="lang-scss prettyprint-override"><code>//App.scss
  
  background-image: url(../images/a.jpg);
  </code></pre>
  <p>After bundle and create <code>app.css</code> I need to relative path but that is routed from the root <code>/</code>.</p>
  <p><strong>Actual Result:</strong></p>
  <pre class="lang-css prettyprint-override"><code>background-image: url(/images/a.jpg);
  </code></pre>
  <p><strong>Expected Result:</strong></p>
  <pre class="lang-css prettyprint-override"><code>background-image: url(../../images/a.jpg);
  </code></pre>
  <p><strong>I tested <code>processCssUrls: false</code> options and I don't want to use it</strong></p>