Lesson 8 and fixed the broken links

etc/quiz-src/questions-en.txt

lessons/2-Symbolic/README.md

lessons/3-NeuralNetworks/03-Perceptron/README.md

lessons/3-NeuralNetworks/04-OwnFramework/README.md

lessons/3-NeuralNetworks/05-Frameworks/IntroPyTorch.ipynb

lessons/3-NeuralNetworks/05-Frameworks/Overfitting.md

lessons/3-NeuralNetworks/05-Frameworks/README.md

lessons/3-NeuralNetworks/05-Frameworks/lab/README.md

lessons/4-ComputerVision/07-ConvNets/CNN_Architectures.md

lessons/4-ComputerVision/07-ConvNets/ConvNetsTF.ipynb

lessons/4-ComputerVision/07-ConvNets/README.md

lessons/4-ComputerVision/08-TransferLearning/README.md

...ns/4-ComputerVision/08-TransferLearning/TrainingTricks.md

...mputerVision/08-TransferLearning/TransferLearningTF.ipynb

...4-ComputerVision/08-TransferLearning/lab/OxfordPets.ipynb

lessons/4-ComputerVision/08-TransferLearning/lab/README.md