[Improve][Doc] Add some connector icons

[zhangshenghang]

Purpose of this pull request

Add some connector icons

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• [ ] If any new Jar binary package adding in your PR, please add License Notice according New License Guide
• [ ] If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• [ ] If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• [ ] Update the release-note.

[Hisoka-X]

e.g. Hdfs文件.svg Apache Iceberg.svg

Should it contain spaces and Chinese characters?

cc @Hisoka-X

Yep, the current logic is use markdown header name to mapping icon file. So the header name is contains chinese, the icon file should contains it too.

[hailin0]

e.g. Hdfs文件.svg Apache Iceberg.svg

Should it contain spaces and Chinese characters?

cc @Hisoka-X

https://github.com/apache/seatunnel/issues/7954