fix(docs): replace unpkg in codepen w/ jsdelivr

[SukkaW]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

UNPKG has not been actively maintained and has been down since Mar 15, 2025 was down from Mar 15, 2025, 2:00 AM and down for 18 hours (unpkg/unpkg#412). Migrating to jsDelivr means a more stable and reliant service.

This breaks existing codepens.

Solution

The PR replaces UNPKG usage with jsDelivr so that codepen works again.

How is the change tested?

This can be tested by spinning up the local development environment and see if the newly created codepen works or not.

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

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[SukkaW]

UNPKG was down again from Mar 31, 2025, 7:00 AM UTC and lasted 8 hours (unpkg/unpkg#443), I urge everyone to immediately migrate away from unpkg to jsDelivr now.