🔥 Remove logic for development dependencies and Jupyter, it was never documented, and I no longer use that trick (#1355)

backend/Dockerfile

@@ -11,9 +11,7 @@ RUN curl -sSL https://install.python-poetry.org | POETRY_HOME=/opt/poetry python
 # Copy poetry.lock* in case it doesn't exist in the repo
 COPY ./pyproject.toml ./poetry.lock* /app/
 
-# Allow installing dev dependencies to run tests
-ARG INSTALL_DEV=false
-RUN bash -c "if [ $INSTALL_DEV == 'true' ] ; then poetry install --no-root ; else poetry install --no-root --only main ; fi"
+RUN poetry install --no-root
 
 ENV PYTHONPATH=/app