docs: 修正构建后的 cssinjs-benchmark demo 无法查看耗时的问题

[arvinxx]

demo 迁移至独立项目：https://github.com/arvinxx/cssinjs-benchmark

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[github-actions[bot]]

:tada: This PR is included in version 3.4.0-alpha.1 :tada:

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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[github-actions[bot]]

:tada: This PR is included in version 3.4.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: