feat!: Drop the QGAN model and related tests and docs

Author: alecandido

doc/source/api-reference/qibo.rst

@@ -167,14 +167,6 @@ Feedback-based Algorithm for Quantum Optimization (FALQON)
     :member-order: bysource
 
 
-Style-based Quantum Generative Adversarial Network (style-qGAN)
-"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
-
-.. autoclass:: qibo.models.qgan.StyleQGAN
-    :members:
-    :member-order: bysource
-
-
 Grover's Algorithm
 """"""""""""""""""
 

src/qibo/models/__init__.py

@@ -11,5 +11,4 @@
 from qibo.models.evolution import AdiabaticEvolution, StateEvolution
 from qibo.models.grover import Grover
 from qibo.models.qft import QFT
-from qibo.models.qgan import StyleQGAN
 from qibo.models.variational import AAVQE, FALQON, QAOA, VQE