Local development results in white screen or "WebGL is not supported"

[gietema]

When cloning the repository and running one of the example scripts, the resulting visualisation will be a white screen.
(Reported by @MSchnei).

import pandas as pd
import clusterfun as clt

df = pd.read_csv("https://raw.githubusercontent.com/gietema/clusterfun-data/main/cifar10.csv")
clt.confusion_matrix(df, y_true="label", y_pred="pred", media="img_path")

When quickly debugging this issue, I could get this to resolve, but I got a "WebGL is not supported" message instead of the plot (while the search bar and side bar were displayed now).

Needs to be fixed to make it easier for users to contribute.