docs: remove unverified /plugins command documentation

Author: Copilot

01-setup-and-first-steps/README.md

@@ -410,7 +410,6 @@ That's it for getting started! As you become comfortable, you can explore additi
 | `/env` | Show loaded environment details — what instructions, MCP servers, skills, agents, and plugins are active |
 | `/init` | Initialize Copilot instructions for your repository |
 | `/mcp` | Manage MCP server configuration |
-| `/plugins` | Open the plugins dashboard to view and manage installed plugins |
 | `/settings` | Open an interactive dialog to browse and edit all user settings in one place |
 | `/skills` | Manage skills for enhanced capabilities |
 

06-mcp-servers/README.md

@@ -288,8 +288,6 @@ This adds the server and its associated agent skills automatically. The skills i
 - **microsoft-code-reference**: API lookups, code samples, and troubleshooting
 - **microsoft-skill-creator**: A meta-skill for generating custom skills about Microsoft technologies
 
-> 💡 **Managing installed plugins**: After installing plugins, use `/plugins` to open the plugins dashboard. From there you can view, enable, disable, or remove any installed plugin — no need to edit config files manually.
-
 **Usage:**
 ```bash
 copilot