Add Deep Learning intro py file

app.py

@@ -81,7 +81,7 @@ def main():
             - For a **Neural Network**, imagine adding layers of neurons. Each neuron applies a weighted sum, then an activation function. The model learns through backpropagation, adjusting weights to minimize the error over time.
         """)
         
-        nn_image_url = "https://raw.githubusercontent.com/gridflowai/gridflowAI-datasets-icons/ab018053d82052aa9b7ce1b0e9a76410663af734/AI-icons-images/nn.png"
+        nn_image_url     = "https://raw.githubusercontent.com/gridflowai/gridflowAI-datasets-icons/ab018053d82052aa9b7ce1b0e9a76410663af734/AI-icons-images/NN.png"
         neuron_image_url = "https://raw.githubusercontent.com/gridflowai/gridflowAI-datasets-icons/ab018053d82052aa9b7ce1b0e9a76410663af734/AI-icons-images/neuron.png"
         
         st.image(neuron_image_url, caption="Linear regression - single neuron unit", use_column_width ='auto')