Updated the first ode example to analyze the correctness of the neural networks assembled by the DESolver
Corrected some examples to reflect the structural changes in the previous commit

Updated the structure and functionality of NeuralNEtwork class to account for the changes in connections and neurons.
Updated the logic in DESolver to account for the changes in NeuralNetwork

Changed the structure and Connections, Neurons and Neural networks to be more clean and better suited for solving differential equations

Adjusted the class DESolver to account for the changes