Update index.md

Author: mtian8

docs/index.md

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     [:octicons-arrow-right-24: Installation & usage](https://github.com/scicode-bench/SciCode)
 
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 -   :material-book:{ .lg .middle } __Paper__
 
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     [:octicons-arrow-right-24: Read the paper](https://arxiv.com)
 
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 -   :material-book:{ .lg .middle } __Dataset__
 
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     [:octicons-arrow-right-24: Download Dataset](leaderboard.md)
 
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 -   :material-book:{ .lg .middle } __Leaderboard__
 
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     [:octicons-arrow-right-24: Browse the results](leaderboard.md)
 
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 ## Introduction