Update the DataFusion in Python website

[Weijun-H]

Describe the bug
The logo and the links on the website, https://datafusion.apache.org/python/, are outdated and deprecated. We should check and update them.

[Michael-J-Ward]

@Weijun-H, could you please be more specific?

Which logo and links on which website?

I notice the example links are brokin on the PyPI site: https://pypi.org/project/datafusion/

[Weijun-H]

@Michael-J-Ward, I have updated the issue. I hope this makes it clearer.

[Michael-J-Ward]

Thanks, @Weijun-H

And I see the new logo on https://datafusion.apache.org/