update broken selectors link (parcel-bundler#750)

Author: 20jasper

website/index.html

@@ -170,7 +170,7 @@ <h3>CSS modules</h3>
       <section class="parser">
         <div>
           <h3>Browser grade</h3>
-          <p><strong>Lightning CSS is written in Rust, using the <a href="https://github.com/servo/rust-cssparser" target="_blank">cssparser</a> and <a href="https://github.com/servo/servo/tree/master/components/selectors" target="_blank">selectors</a> crates created by Mozilla and used by Firefox.</strong> These provide a solid CSS-parsing foundation on top of which Lightning CSS implements support for all specific CSS rules and properties.</p>
+          <p><strong>Lightning CSS is written in Rust, using the <a href="https://github.com/servo/rust-cssparser" target="_blank">cssparser</a> and <a href="https://github.com/servo/stylo/tree/main/selectors" target="_blank">selectors</a> crates created by Mozilla and used by Firefox.</strong> These provide a solid CSS-parsing foundation on top of which Lightning CSS implements support for all specific CSS rules and properties.</p>
           <p style="font-size: 0.85em">Lightning CSS fully parses every CSS rule, property, and value just as a browser would. This reduces duplicate work for transformers, leading to improved performance and minification.</p>
           <p><a href="transforms.html">Custom transforms →</a></p>
         </div>