Add empty files for extensions structure in docs

docs/extensions/get-started/your-first-extension.md

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+# Your First Extension
+
+In this topic, we'll teach you the fundamental concepts for building extensions. Make sure you have [Node.js](https://nodejs.org/en/) and [Git](https://git-scm.com/) installed....
+
+## Developing the extension
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam non ligula id tellus vehicula vestibulum sed quis neque. Pellentesque sed mollis augue, sit amet condimentum enim. Morbi commodo risus gravida dui gravida, ac vulputate erat consectetur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi dapibus molestie augue. 
+
+## Debugging the extension
+
+And now this:
+
+- One
+- Two
+- Three
+
+
+## Next steps
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam non ligula id tellus vehicula vestibulum sed quis neque. Pellentesque sed mollis augue, sit amet condimentum enim. Morbi commodo risus gravida dui gravida, ac vulputate erat consectetur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi dapibus molestie augue. 
+

docs/extensions/overview.md

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+# Lens Extension API
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam non ligula id tellus vehicula vestibulum sed quis neque. Pellentesque sed mollis augue, sit amet condimentum enim. Morbi commodo risus gravida dui gravida, ac vulputate erat consectetur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi dapibus molestie augue. Donec rutrum ultricies elit, sed posuere libero placerat quis. Ut sodales quam vel odio luctus, ut pharetra dui vestibulum. Nam pulvinar scelerisque erat sit amet vestibulum. Nullam posuere ac justo nec scelerisque. Fusce in congue odio.
+
+## What can extensions do?
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam non ligula id tellus vehicula vestibulum sed quis neque. Pellentesque sed mollis augue, sit amet condimentum enim. Morbi commodo risus gravida dui gravida, ac vulputate erat consectetur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi dapibus molestie augue. 
+
+## How to build extensions?
+
+And now this:
+
+- One
+- Two
+- Three
+
+
+## What's new?
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam non ligula id tellus vehicula vestibulum sed quis neque. Pellentesque sed mollis augue, sit amet condimentum enim. Morbi commodo risus gravida dui gravida, ac vulputate erat consectetur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi dapibus molestie augue. 
+
+## Looking for help
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam non ligula id tellus vehicula vestibulum sed quis neque. Pellentesque sed mollis augue, sit amet condimentum enim. Morbi commodo risus gravida dui gravida, ac vulputate erat consectetur. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi dapibus molestie augue. 
+
+
+## Download Lens K8s IDE
+
+Go to [Lens](https://k8slens.dev)