github URLs changed, making examples disfunctional.

[dothebart]

the https://dash.plotly.com/minimal-app sample has this code:

df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/gapminder_unfiltered.csv')

however, it seems that it doesn't return content anymore, but rather this is the correct URL:

df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/refs/heads/master/gapminder_unfiltered.csv')

probably more parts of the documentation referencing these sample repo will fail