[Feature][Doc] Add icon for connectors

[Hisoka-X]

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Description

Add custom icons for our all connectors.

https://seatunnel.apache.org/docs/connector-v2/source
Please refer facebook/docusaurus#10476 (comment)

Usage Scenario

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

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

[zhangshenghang]

Can be assigned to me

[zhangshenghang]

@Hisoka-X
The implementation method and effect are as follows. If there is no problem, I will start to modify it.
It will support the following three configurations: SVG, PNG, and Link.
e.g.
svg

png

link

effect

[Hisoka-X]

@Hisoka-X The implementation method and effect are as follows. If there is no problem, I will start to modify it. It will support the following three configurations: SVG, PNG, and Link. e.g. svg png link

effect

Looking great! Thanks @zhangshenghang for the demo.