replace demo website

[stoneshi-yunify]

current demo website is https://demo.kubesphere.io/login, please replace it with https://kubesphere.cloud/console/managed-cluster/

[seeinghr]

English website replaces with https://kubesphere.cloud/en/console/managed-cluster/

[stoneshi-yunify]

pls also update the Demo tooltips.

in order to use kubesphere.cloud, user must register and login. there is no demo account for public use.

[seeinghr]

Bug 1: After switching between Chinese and English, the operation flow on the popup window after hover demo does not match. Please check and contact relevant colleagues to adjust it.

[seeinghr]

Suggestion 1:

• When users are on kubesphere.io, since the default environment is English, it is recommended to jump to the English login page of KubeSphere Cloud after clicking the demo: https://kubesphere.cloud/en/console/managed-cluster/
• When users switch language to Chinese, at kubesphere.io/zh/, you can jump to the Chinese login page of KubeSphere Cloud after clicking Demo: https://kubesphere.cloud/console/managed-cluster/.

Suggestion 2:

• When users are on kubesphere.com.cn, since the default environment is Chinese, it is recommended to jump to the Chinese login page of KubeSphere Cloud after clicking the demo: https://kubesphere.cloud/console/managed-cluster/
• When users switch language to English, at kubesphere.com.cn/en/, you can jump to the English login page of KubeSphere Cloud after clicking Demo: https://kubesphere.cloud/en/console/managed-cluster/.