docs: Add new Great expectations example (#142)

* chore: Showcase Gumbel-Softmax activation [SD-17] (#130)

* Theoretical part

* Moved to regular examples

* Added the comparison

* Change model to WGAN_GP, add cat_feat histograms

* Fix bullet points

* Improvements on the notebook 1/2

* Improvements on the notebook 2/2

* chore: Add notebook for integrating great_expectations (#127)

* Add tutorial notebook for Great Expectation integration using credit fraud dataset

* Add visuals, change to WGAPGP, epochs and incorporate other feedback

* Minor text changes

Co-authored-by: Francisco Santos <36741643+jfsantos-ds@users.noreply.github.com>
Co-authored-by: Arunn Thevapalan <arunn.work@gmail.com>

Author: 3 people