docs: update featrue intro

[yutingzhao1991]

修改一下特性描述。把对 Ant Design 友好改为灵活的主题定制能力，吸引非 antd 项目采用。

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Latest commit: 5fb49d0611807784e06bac6f2484f39290f4f644

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 1, 2024 9:51am

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.99%. Comparing base (7d32958) to head (5fb49d0). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1229 +/- ## ======================================= Coverage 99.99% 99.99% ======================================= Files 858 858 Lines 18295 18315 +20 Branches 1592 1615 +23 ======================================= + Hits 18294 18314 +20 Misses 1 1 ```

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