Update poetry demo due to major version change
Summary
Poetry is now on major version 2 and has had some significant changes.
The poetry shell command is deprecated and [tool.poetry.scripts] are no longer are available on the path.
This commit updates updates the docs and the initHook to ensure that scripts are available.
It makes the compromise of using poetry to manage the installed python version instead of devbox
Issue: Poetry shell missing scripts
How was it tested?
By following the instructions in the poetry-demo example README.md (which has been edited).
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