index: add repo url, and search hint

ustclug · Apr 20, 2024 · 9d733bf · 9d733bf
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diff --git a/docs/index.md b/docs/index.md
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 # 帮助首页
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+帮助仓库：<https://github.com/ustclug/mirrorhelp>。有关本帮助的问题，可在仓库中创建 issue 或提交 PR。
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+提示：可以按下 `S` 键开始搜索。