docs: Include Mistral Vibe setup in README (ChromeDevTools#1801)

Add Mistral Vibe configuration instructions to README.

Author: natorion

README.md

@@ -373,6 +373,21 @@ Once connected, the Chrome DevTools MCP tools will be available in StudioAssist.
 
 </details>
 
+<details>
+  <summary>Mistral Vibe</summary>
+
+Add in ~/.vibe/config.toml:
+
+```toml
+[[mcp_servers]]
+name = "chrome-devtools"
+transport = "stdio"
+command = "npx"
+args = ["chrome-devtools-mcp@latest"]
+```
+
+</details>
+
 <details>
   <summary>OpenCode</summary>