[Doc] Many image's paths in documents should be corrected to '/static/images/...'

[pandaapo]

Many image's paths in documents are incorrect, including design documents, explanatory documents, etc.
For example
https://github.com/apache/eventmesh-site/blob/master/docs/design-document/01-event-handling-and-integration/01-runtime-protocol.md

https://github.com/apache/eventmesh-site/blob/master/docs/design-document/01-event-handling-and-integration/03-cloudevents.md

https://github.com/apache/eventmesh-site/blob/master/docs/design-document/01-event-handling-and-integration/04-event-bridge.md

https://github.com/apache/eventmesh-site/blob/master/docs/design-document/01-event-handling-and-integration/06-workflow.md

https://github.com/apache/eventmesh-site/blob/master/docs/design-document/02-stream.md

https://github.com/apache/eventmesh-site/blob/master/docs/design-document/03-schema-registry.md
......

The correct path for most images should be /static/images/... instead of /images/....

[pandaapo]

Docusaurus build error will be caused. #170 (comment)