docs: Removed version column in 4.0

[472756921]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue

ref: #19815

💡 Background and solution

ref: #19815

📝 Changelog

Language	Changelog
🇺🇸 English	Removed version column in 4.0
🇨🇳 Chinese	删除相关版本号

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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View rendered components/breadcrumb/index.zh-CN.md
View rendered components/dropdown/index.en-US.md
View rendered components/dropdown/index.zh-CN.md

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[codecov]

Codecov Report

Merging #19825 into 4.0-prepare will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           4.0-prepare   #19825   +/-   ##
============================================
  Coverage        97.46%   97.46%           
============================================
  Files              288      288           
  Lines             7219     7219           
  Branches          1996     1996           
============================================
  Hits              7036     7036           
  Misses             183      183

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[zombieJ]

components/breadcrumb/index.en-US.md seems not sync with components/breadcrumb/index.zh-CN.md. Should update English version.