update the header of website

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: faweizhao26

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubesphere/website/blob/master/OWNERS)~~ [faweizhao26] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[netlify[bot]]

✅ Deploy Preview for kubesphere-website ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	8679f3c7a9a81d126e8849e0751b790615e378b6
🔍 Latest deploy log	https://app.netlify.com/sites/kubesphere-website/deploys/66e16d4a3fb51b0008d77a8e
😎 Deploy Preview	https://deploy-preview-3168--kubesphere-website.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[zheng1]

/lgtm