Add Replicate demo and API

[chenxwh]

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Hi @LiheYoung ,

Great work on Depth-Anything!

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