Update repo link in index.zh.md

[HaveF]

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[codecov]

Codecov Report

Merging #60 (3368937) into main (b899e9b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #60   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           56        56           
  Lines         1017      1017           
=========================================
  Hits          1017      1017           

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