Add monarch distributed tutorial (#3613)

## Description
This adds a tutorial demonstrating how to use Monarch alongside TorchTitan to
spin up distributed jobs from a single controller.

Author: amirafzali

distributed.rst

@@ -193,5 +193,6 @@ Custom Extensions
    intermediate/rpc_tutorial
    intermediate/rpc_param_server_tutorial
    intermediate/rpc_async_execution
+   intermediate/monarch_distributed_tutorial
    advanced/rpc_ddp_tutorial
    advanced/generic_join

index.rst

@@ -674,6 +674,13 @@ Welcome to PyTorch Tutorials
    :link: intermediate/TCPStore_libuv_backend.html
    :tags: Parallel-and-Distributed-Training
 
+.. customcarditem::
+   :header: Interactive Distributed Applications with Monarch
+   :card_description: Learn how to spin up distributed applications using Monarch's singler controller model
+   :image: _static/img/thumbnails/cropped/generic-pytorch-logo.png
+   :link: intermediate/monarch_distributed_tutorial.html
+   :tags: Parallel-and-Distributed-Training
+
 .. Edge
 
 .. customcarditem::