[doc] cherry-pick index.md

rm in JuliaLang/julia#41370 file history: https://github.com/JuliaLang/julia/commits/0de41e27703768cfb8036db680d54cdf8175ba9f/stdlib/SHA/docs/src/index.md
JuliaCrypto · Oct 20, 2021 · 7be6657 · 7be6657
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commit 7be6657
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diff --git a/stdlib/SHA/docs/src/index.md → docs/src/index.md b/stdlib/SHA/docs/src/index.md → docs/src/index.md