Add empty files for extensions structure in docs

docs/setup/linux.md

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+# Lens on Linux
+
+## Installation
+
+See the [Download Lens](https://github.com/lensapp/lens/releases) page for a complete list of available installation options.
+
+
+
+### Snap
+
+Lens is officially distributed as a Snap package in the [Snap Store](https://snapcraft.io/store):
+
+[![Get it from the Snap Store](images/snap-store.png)](https://snapcraft.io/kontena-lens)
+
+You can install it by running:
+
+```bash
+sudo snap install kontena-lens --classic
+```

docs/setup/macos.md

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+# Lens on macOS
+
+## Installation
+
+1. [Download Lens](https://github.com/lensapp/lens/releases) for macOS.
+2. Open the browser's download list and locate the downloaded archive.
+3. Select the 'magnifying glass' icon to open the archive in Finder.
+4. Double-click `Lens-{version}.dmg` and drag `Lens.app` to the `Applications` folder, making it available in the macOS Launchpad.
+5. Add Lens to your Dock by right-clicking on the icon to bring up the context menu and choosing **Options**, **Keep in Dock**.

docs/setup/network.md

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+# Network Connections in Lens
+
+Lens is built on top of Electron and benefits from all the networking stack capabilities of Chromium. 
+
+
+## Proxy server support
+
+...

docs/setup/overview.md

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+# Setting up Lens
+
+Getting up and running with Lens is quick and easy. It is a small download so you can install in a matter of minutes and give Lens a try.
+
+
+## Cross platform
+
+Lens is the most powerful IDE for people who need to deal with Kubernetes clusters on a daily basis which runs on the macOS, Linux, and Windows operating systems.
+
+Follow the platform-specific guides below:
+
+* [Linux](/setup/linux/)
+* [macOS](/setup/macos/)
+* [Windows](/setup/windows/)
+
+Lens is lightweight and should run on most available hardware and platform versions. You can review the [System Requirements](/supporting/requirements/) to check if your computer configuration is supported.
+
+
+## Update cadence
+
+...

docs/setup/windows.md

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+# Lens on Windows
+
+## Installation
+
+1. Download the [Lens installer](https://github.com/lensapp/lens/releases) for Windows.
+2. Once it is downloaded, run the installer `Lens-Setup-{version}.exe`. This will only take a minute.
+3. By default, Lens is installed under `C:\users\{username}\AppData\Local\Programs\Lens`.