[文档维护] 能不能维护一下文档啊

### Search before asking

- [ ] I had searched in the [issues](https://github.com/DTStack/chunjun/issues) and found no similar question.

- [ ] I had googled my question but i didn't get any help.

- [ ] I had read the documentation: [ChunJun doc](https://dtstack.github.io/chunjun) but it didn't help me.

### Description

如题，很多文档都没有维护了，甚至都找不到了，比如http连接器的文档就没有，功能也更新过好几版本，但是新版的文档都没有了，能不能维护一下啊。

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