Docs: Remove outdated and misleading Poetry guide (readthedocs#9794)

* Docs: Remove outdated and misleading Poetry guide

* Docs: Removed toc poetry entry

Author: juantocamidokura

docs/user/guides/developers.rst

@@ -14,7 +14,6 @@ or customize the documentation appearance.
    reproducible-builds
    embedding-content
    conda
-   poetry
    remove-edit-buttons
    build-using-too-many-resources
    edit-source-links-sphinx