Trends and Trendlines in Time Series Data

[s2t2]

Add chapter. Use material from:

https://github.com/prof-rossetti/python-for-finance/blob/main/docs/notes/dataviz/trendlines.qmd

https://colab.research.google.com/drive/1z2iHgHROQHJqpgruADbAKbBGSdj3Lbrp?usp=sharing#scrollTo=TJAef_yqcfjM

Also candle stick charts:

https://github.com/prof-rossetti/python-for-finance/blob/main/docs/notes/dataviz/candlestick-charts.qmd