docs: add faucet link

[yutingzhao1991]

添加水龙头地址 https://zan.top/faucet?chInfo=ch_antdweb3 指引开发者获取测试网 ETH

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4adbc99

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2024 3:48am

[github-actions]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.99%. Comparing base (f482f58) to head (4adbc99).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1170   +/-   ##
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  Coverage   99.99%   99.99%           
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  Files         846      846           
  Lines       18056    18056           
  Branches     1575     1575           
=======================================
  Hits        18055    18055           
  Misses          1        1           

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