website: add more use cases in en version.

[GuangmingLuo]

What type of PR is this?

Check the PR title.

• [ ] This PR title match the format: \<type>(optional scope): \<description>
• [ ] The description of this PR title is user-oriented and clear enough for others to understand.

(Optional) Translate the PR title into Chinese.

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: dd more use cases in en version zh(optional): 网站英文版本添加更多用户案例，用户案例待翻译（TODO）

(Optional) Which issue(s) this PR fixes:

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[GuangmingLuo]

有兴趣参与用户案例翻译的同学，欢迎直接提交 PR。