style: 🔤 Tweak font family, same as tailwindcss

[afc163]

🤔 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 link

• https://tailwindcss.com/docs/font-family/#app
• https://github.com/twbs/bootstrap/pull/26889]
• Dark theme should have same font family with default theme

💡 Background and solution

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📝 Changelog

Language	Changelog
🇺🇸 English	Tweak font family to be same as tailwindcss
🇨🇳 Chinese	微调默认字体和 tailwindcss 一致。

☑️ 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 docs/spec/font.en-US.md
View rendered docs/spec/font.zh-CN.md

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[codecov]

Codecov Report

Merging #20747 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20747   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files         296      296           
  Lines        6879     6879           
  Branches     1912     1865   -47     
=======================================
  Hits         6705     6705           
  Misses        174      174

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