docs: 下线欧洲人口总数 demo

[lvisei]

PR includes

• [ ] fixed #0
• [ ] add / modify test cases
• [ ] documents, demos

Screenshot

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[github-actions[bot]]

🎊 PR Preview 818b37874711b00aa8d1270c385de15e20ba2b29 has been successfully built and deployed to https://antvis-L7Plot-preview-pr-279.surge.sh

:clock1: Build time: 504.168s

_{🤖 By surge-preview}

[lvisei]

https://github.com/ant-design/ant-design-charts/issues/1853