Refactor Project Web Site to use Docsy

[csviri]

The current Jekyll template has more issue, it does not support links properly of sub section (and does not work sometimes), does not support sub section in menus, blog is not supported.

Docsy seems to support nicely all those features we require:

https://github.com/google/docsy https://gohugo.io/hosting-and-deployment/hosting-on-github/

[github-actions[bot]]

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[csviri]

done