Add referrer info

Author: ntrogh

docs/copilot/ai-powered-suggestions.md

@@ -16,7 +16,7 @@ GitHub Copilot acts as an AI-powered pair programmer, automatically offering sug
 
 1. Install the GitHub Copilot extensions.
 
-    > <a class="install-extension-btn" href="vscode:extension/GitHub.copilot">Install the GitHub Copilot extensions</a>
+    > <a class="install-extension-btn" href="vscode:extension/GitHub.copilot?referrer=docs-copilot-ai-powered-suggestions">Install the GitHub Copilot extensions</a>
 
 1. Sign in with your GitHub account to use Copilot.
 

docs/copilot/copilot-chat.md

@@ -36,7 +36,7 @@ You can use Copilot Chat in various developer scenarios, such as:
 
 1. Install the GitHub Copilot extensions.
 
-    > <a class="install-extension-btn" href="vscode:extension/GitHub.copilot">Install the GitHub Copilot extensions</a>
+    > <a class="install-extension-btn" href="vscode:extension/GitHub.copilot?referrer=docs-copilot-copilot-chat">Install the GitHub Copilot extensions</a>
 
 1. Sign in with your GitHub account to use Copilot.
 

docs/copilot/overview.md

@@ -60,12 +60,12 @@ GitHub Copilot can provide assistance in a variety of scenarios.
 
 1. Install the GitHub Copilot extensions.
 
-    > <a class="install-extension-btn" href="vscode:extension/GitHub.copilot">Install the GitHub Copilot extensions</a>
+    > <a class="install-extension-btn" href="vscode:extension/GitHub.copilot?referrer=docs-copilot-overview">Install the GitHub Copilot extensions</a>
 
 1. Sign in with your GitHub account to use Copilot.
 
     > [!TIP]
-    > You can get started for free with the [Copilot Free plan](TODO) if you don't yet have a Copilot subscription. Follow the steps in the [setup guide](/docs/copilot/setup.md) to set up a Copilot subscription.
+    > You can get started for free with the [Copilot Free plan](https://github.com/github-copilot/signup) if you don't yet have a Copilot subscription. Follow the steps in the [setup guide](/docs/copilot/setup.md) to set up a Copilot subscription.
 
 1. Discover the key features of Copilot in VS Code with our [Copilot Quickstart](/docs/copilot/getting-started.md).
 

docs/copilot/setup.md

@@ -61,7 +61,7 @@ After you've signed in to your GitHub account and have access to Copilot, start
 
 To manually install the GitHub Copilot extensions:
 
-> <a class="install-extension-btn" href="vscode:extension/GitHub.copilot">Install the GitHub Copilot extensions</a>
+> <a class="install-extension-btn" href="vscode:extension/GitHub.copilot?referrer=docs-copilot-setup">Install the GitHub Copilot extensions</a>
 
 You can also open the Extensions view and search for *GitHub Copilot* to install the extension.