Please sync up docs along with the releases

[sarojbelbase]

• I have searched the issues of this repo and believe that this is not a duplicate.

Issue

Please sync/update the documentation with the official website https://python-poetry.org/ or just setup a wiki page here on Github. There are many updated sections that hasn't been synced yet.

I was having issues with cli > cache and found out that it's serving outdated content on the main site.

[Terseus]

Yes please, update the official site doc.

I was looking for the doc about the new plugin system implemented in #3733 and when looking the website I though it wasn't released but it is, it's very confusing.

Maybe it can be updated automatically with Github actions or something?

[finswimmer]

The documentation should now be in sync with the 1.1 branch and master branch automatically.

[github-actions]

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