fix: install poetry deps into system Python in CI (closes #5)

The docs pipeline failed because poetry install creates a virtualenv,
but the chart generation script ran with system Python — outside the
venv — so scipy (and all other deps) were not found.

Fix: poetry config virtualenvs.create false before install, so all
packages install into the CI runner's system Python directly.

Author: MDUYN

.github/workflows/deploy-docs.yml

@@ -37,6 +37,7 @@ jobs:
         run: |
           pip install --upgrade pip
           pip install poetry
+          poetry config virtualenvs.create false
           poetry install --no-interaction
           pip install plotly kaleido investing-algorithm-framework