Update examples to use California housing dataset

[jklaise]

Fixes #490.

Todo:

• cfproto_housing.ipynb
• ale_regression_boston.ipynb -> ale_regression_california.ipynb
• Update links

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Codecov Report

Merging #838 (f5765e4) into master (9434625) will increase coverage by 0.71%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #838      +/-   ##
==========================================
+ Coverage   84.51%   85.22%   +0.71%     
==========================================
  Files          74       74              
  Lines        8667     8727      +60     
==========================================
+ Hits         7325     7438     +113     
+ Misses       1342     1289      -53     

Flag	Coverage Δ
ubuntu-latest-3.10	85.18% <ø> (?)
ubuntu-latest-3.7	84.98% <ø> (+0.46%)	⬆️
ubuntu-latest-3.8	85.02% <ø> (?)
ubuntu-latest-3.9	85.11% <ø> (?)
windows-latest-3.9	82.84% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
alibi/api/defaults.py	100.00% <0.00%> (ø)
alibi/explainers/tests/test_simiarlity/conftest.py	100.00% <0.00%> (ø)
alibi/explainers/shap_wrappers.py	92.29% <0.00%> (+0.01%)	⬆️
alibi/explainers/cfrl_base.py	87.87% <0.00%> (+0.08%)	⬆️
alibi/explainers/anchors/anchor_text.py	94.44% <0.00%> (+0.13%)	⬆️
alibi/explainers/partial_dependence.py	94.60% <0.00%> (+0.21%)	⬆️
alibi/utils/missing_optional_dependency.py	94.44% <0.00%> (+0.32%)	⬆️
alibi/utils/approximation_methods.py	82.22% <0.00%> (+0.40%)	⬆️
alibi/explainers/pd_variance.py	98.78% <0.00%> (+0.40%)	⬆️
alibi/explainers/permutation_importance.py	97.09% <0.00%> (+0.42%)	⬆️
... and 5 more

[jklaise]

Note that due to an unfortunate bug in jupyter regarding dollar sign escaping there is some slight weirdness with extra lines in the paragraph describing the effect of median income - due to jupyter not being able to render more than one dollar sign in the same paragraph: jupyterlab/jupyterlab#8645