[Improve][Doc] Update the user manual for Dashboard

[dockerzhang]

Description

Update the user manual for the Dashboard according to the latest page, address: https://inlong.apache.org/docs/next/user_guide/dashboard_usage/

• Include English and Chinese.
• update the content according to the latest version.

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Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[Jzow]

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