[WeOpen-Star] Improve EventMesh website

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found no similar issues.

### Enhancement Request

Hi, we are organizing an activity ‘WeOpen-Star’ with WeOpen (the Open Source Community managed by Tencent), and we sincerely invite you to join our EventMesh community and help us improve our website. Once you finish the task successfully, you could become our 'Contributor of Apache EventMesh (Incubating)', and get a well-designed certificate and 50 credits from WeOpen.

The following links are issues related which are not assigned yet. For more details, please refer to the specific issue link. Feel free to select one as your task~

### Describe the solution you'd like

Please comment something like "Hi, I want to participate in your WeOpen-Star activity, and submit a PR" in the specific issue link, so that we could assign the task to you.
Please note that you can only participate in the task related to 'improve our website' no more twice.

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

This issue does not name a file, test, entry point, or concrete website change. Start by opening one of the related, unassigned issues referenced in the body and follow its scope; completion is a pull request implementing that issue's requested website improvement.

Written by the indexing model from the issue text.