Update index.md

Author: mtian8

docs/index.md

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 ‡ Corresponding to: {mtian8, haopeng}@illinois.edu, [email protected]
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     Learn all the details
 
     [:octicons-arrow-right-24: Read the paper](https://arxiv.com)
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 -   :material-book:{ .lg .middle } __Dataset__
 
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     (Coming soon...)
 
     [:octicons-arrow-right-24: Browse the results](leaderboard.md)
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 ## Introduction