Add top navigation links and remove the hero image from the model card.

README.md

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-<!-- <img src="./assets/release-hero.svg" alt="MiniCPM-OCR: fast, accurate document parsing into text, tables, and formulas, with a decision model that flags regions needing review." width="100%"> -->
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-<p align="center"><strong>MiniCPM-OCR &middot; Fast, accurate parsing for real-world documents.</strong></p>
+[GitHub](https://github.com/OpenBMB/MiniCPM-OCR) · [API](https://github.com/OpenBMB/MiniCPM-OCR/blob/main/docs/minicpm_ocr_jev_api_en.md) · [Demo](https://platform.modelbest.ai/console/playground/document-parse)
 
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