Broken link in `examples/generalized_linear_models/multilevel_modeling.ipynb`

[pipme]

Notebook title:
examples/generalized_linear_models/multilevel_modeling.ipynb

Notebook url:
https://www.pymc.io/projects/examples/en/latest/generalized_linear_models/multilevel_modeling.html#multilevel-and-hierarchical-models

Issue description

The links to external images are broken.