feat: add MCP server configuration for notebook tools

Add .mcp.json to enable the notebook MCP server when the plugin is installed.
This allows users to interact with Jupyter notebooks using MCP tools for
creating, reading, updating, and deleting notebook cells.

The MCP server is exposed as "notebook" and uses the bundled
mcp_proxy_bundle.cjs from the notebook_mcp directory.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: ellurubharath-eng

.mcp.json

@@ -0,0 +1,11 @@
+{
+  "mcpServers": {
+    "notebook": {
+      "command": "node",
+      "args": [
+        "notebook_mcp/bin/mcp_proxy_bundle.js"
+      ],
+      "env": {}
+    }
+  }
+}