【documentation】remove whizard and notification-history docs

[zhuxiujuan28]

https://kubesphere.com.cn/kse/compare-products/

KubeSphere 不支持启用可观测中心；不显示通知历史

删除对应文档

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[zhuxiujuan28]

/assign @junotx
please review the changes
https://deploy-preview-3236--kubesphere-website.netlify.app/zh/docs/v4.1/11-use-extensions/05-observability-platform/

[junotx]

/lgtm

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: junotx, zhuxiujuan28
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[zhuxiujuan28]

@zheng1 please merge it

[zheng1]

/approve