Integrate Mubert

[kabachuha]

Look like the Mubert team has already integrated it with Deforum in their Colab doc, so it should be easy to backport it here as well

https://github.com/MubertAI/Mubert-Text-to-Music/blob/main/Deforum_Stable_Diffusion_Mubert.ipynb

[kabachuha]

Although after looking through their website it seems they're not as free and opensource to use as Stable Diffusion, so a discussion is needed