Add link to Replicate demo

We've added LTX to Replicate here:
https://replicate.com/fofr/ltx-video

I'd love to move this to your organization, so the URL would be:

https://replicate.com/lightricks/ltx-video – please let me know if you're ok with that.

README.md

@@ -45,6 +45,7 @@ You can use the model for purposes under the [license](https://github.com/Lightr
 ### Online demo
 The model is accessible right away via following links:
 - [HF Playground](https://huggingface.co/spaces/Lightricks/LTX-Video-Playground)
+- [Replicate text-to-video and image-to-video](https://replicate.com/fofr/ltx-video)
 - [Fal.ai text-to-video](https://fal.ai/models/fal-ai/ltx-video)
 - [Fal.ai image-to-video](https://fal.ai/models/fal-ai/ltx-video/image-to-video)