review work on jan 11

[rlanzafame]

Part content, part illustration of git and GH workflow for @SFAlgra

[rlanzafame]

Summary of changes"

• gitignore: ignore venv directory
• remove versions from requirements file
• don't use absolute paths (see code below)
• clear outputs from nb's when making commits
• added data to repo (ok when small, or for testing)

what not to do:

import sys
sys.path.append(r'C:\Users\sieme\OneDrive\Documenten\16. TA, Probabilistic Design\bivariate\src')