Add docstrings to pipeline functions - #30

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

scipy 1.5 support can be dropped per PHEP 3 - Version 1.5 is older than the minimum required version (scipy>=1.15)

numpy 1.19 support can be dropped per PHEP 3 - Version 1.19 is older than the minimum required version (numpy>=2.2)

matplotlib 3.3 support can be dropped per PHEP 3 - Version 3.3 is older than the minimum required version (matplotlib>=3.10)

Python 3.9 support can be dropped per PHEP 3 - Python 3.9 is older than the minimum required version (3.12)