Add deploy_app tool to MCP documentation (#11)

* Add `deploy_application` tool to MCP documentation

* the great "application" purge pt 2

Author: masnwilliams

mcp.mdx

@@ -17,8 +17,9 @@ The **Kernel Model Context Protocol (MCP) server** gives any compatible AI model
 The server provides these tools for AI assistants:
 
 ### Kernel Apps
-  - `list_apps` - List applications in your Kernel workspace
-  - `invoke_action` - Execute actions in Kernel applications
+  - `deploy_app` - Deploy TypeScript or Python apps to Kernel
+  - `list_apps` - List apps in your Kernel workspace
+  - `invoke_action` - Execute actions in Kernel apps
   - `get_deployment` - Get deployment status and logs
   - `list_deployments` - List all deployments
   - `get_invocation` - Get action invocation details