docs: improve theme edtor

[yutingzhao1991]

精简主题编辑器中的 Demo，让主题编辑器看上去更简洁，更好用

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Latest commit: 8ea0aee

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 1, 2024 9:29am

[github-actions]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.99%. Comparing base (7d32958) to head (8ea0aee).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1228   +/-   ##
=======================================
  Coverage   99.99%   99.99%           
=======================================
  Files         858      858           
  Lines       18295    18295           
  Branches     1592     1592           
=======================================
  Hits        18294    18294           
  Misses          1        1           

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