make avante public and add note about codegate.nvim

Author: kantord

docs/integrations/avante.mdx

@@ -3,13 +3,20 @@ title: Use CodeGate with avante.nvim
 description: Configure the `avante.nvim` plugin for Neovim
 sidebar_label: avante.nvim
 sidebar_position: 15
-unlisted: true
 ---
 
 **[avante.nvim](https://github.com/yetone/avante.nvim)** is a Neovim plugin that
 provides a Cursor-like user experience. It integrates with multiple AI providers
 (e.g. Claude and OpenAI).
 
+:::note
+
+You can **additionally** install
+[codegate.nvim](https://github.com/stacklok/codegate.nvim), which will provide a
+closer integration with CodeGate.
+
+:::
+
 ## Install avante.nvim
 
 Install the **avante.nvim** plugin using your preferred plugin manager. For