Add Replicate Demo

[lucataco]

Changes proposed in this pull request:

• Add Replicate Demo

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• I've read and followed all steps in the Making a pull request
  section of the CONTRIBUTING docs.
• I've updated or added any relevant docstrings following the syntax described in the
  Writing docstrings section of the CONTRIBUTING docs.
• If this PR fixes a bug, I've added a test that will fail without my fix.
• If this PR adds a new feature, I've added tests that sufficiently cover my new functionality.

About Replicate Demo

Awesome work on olmOCR-7b! This PR enables olmOCR-7b deployment on Replicate through two channels:

• Web interface: lucataco/olmocr-7b
• API endpoint: lucataco/olmocr-7b/api

Happy to create an organization on Replicate for Ai2, and move the model location under your org so you have control over the demo examples and Readme. Also happy to help maintain and keep the model updated 🤗