Fix image path in app.py for class image and model loading

app.py

@@ -9,7 +9,7 @@ title = "Welcome on your first sketch recognition app!"
 # app description
 head = (
   "<center>"
-  "<img src='file/mnist-classes.png' width=400>"
+  "<img src='./mnist-classes.png' width=400>"
   "The robot was trained to classify numbers (from 0 to 9). To test it, write your number in the space provided."
   "</center>"
 )
@@ -24,7 +24,7 @@ img_size = 28
 labels = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
 
 # load model (trained on MNIST dataset)
-model = tf.keras.models.load_model("model/sketch_recognition_numbers_model.h5")
+model = tf.keras.models.load_model("./sketch_recognition_numbers_model.h5")
 
 # prediction function for sketch recognition
 def predict(img):