Add Replicate demo and API

[chenxwh]

Hi @omerbt ,

Great work on TokenFlow and congratulations on the ICLR acceptance!

This pull request makes it possible to run TokenFlow on Replicate (https://replicate.com/cjwbw/TokenFlow) and via API (https://replicate.com/cjwbw/TokenFlow/api). Also happy to transfer the demo page to you so you can make modifications easily :)