Remove warning messages from tutorials

[gvegayon]

Goal

Deal with warnings and extraneous messages in the tutorials.

Context

#91 (comment)

Required features

Review the rendered tutorials on the website and remove (when possible) avoidable warning messages like:

/home/runner/.cache/pypoetry/virtualenvs/pyrenew-ay_vsbmF-py3.12/lib/python3.12/site-packages/tqdm/auto.py:21: TqdmWarning: IProgress not found. Please update jupyter and ipywidgets. See https://ipywidgets.readthedocs.io/en/stable/user_install.html
  from .autonotebook import tqdm as notebook_tqdm

Specifications

• pyrenew_demo.qmd
• example-with-dataset.qmd
• getting-started.qmd