Update file structure

Author: daidr

site/en/docs/extensions/samples/index.md

@@ -1,3 +1,9 @@
+---
+title: 'Chrome Extension Samples'
+description: >
+  The list contains all the samples from the [Extensions sample repository](https://github.com/GoogleChrome/chrome-extensions-samples). Use these to learn how extensions work or as a starting point for building your own extensions.
+---
+
 {% extends "layouts/base.njk" %}
 
 {% block css %}