Er-evaluation

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* Fix handling of NaN values in `compress_memberships()`

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* Small fixes to paper and documentation.

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* Streamline package structure
* Additional tests
* Improved documentation

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* Add sunburst visualization for decision tree regressors
* Add decision tree regression pipeline for subgroup discovery
* Add search utilities
* Prepare submission to JOSS

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* Improve documentation
* Add handling of NA values
* Bug fixes
* Add datasets module
* Add visualization functions
* Performance improvements
* BREAKING: error_analysis functions have been renamed.
* BREAKING: estimators have been renamed.
* Added estimators support for sensitivity analyses
* Added fairness plots
* Performance improvements
* Added `compress_memberships()` function for performance improvements.

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- Refactoring and documentation overhaul.