Reorganize architecture with new directories.

Code isn't working anymore !

app/__init__.py

 import os
 from flask import Flask, render_template
-from app.label_system import sort
+from app.labels_system.label_system import sort
 
 class CustomFlask(Flask):
     jinja_options = Flask.jinja_options.copy()

app/label_system.py → app/labels_system/label_system.py

 from typing import Dict, List
 import json
 from flask import Blueprint
-from app.getter import get_selected_elements, get_discriminating_labels, get_high_discriminating_labels
+from app.labels_system.getter import get_selected_elements, get_discriminating_labels, get_high_discriminating_labels
 
 sort = Blueprint('sort', __name__)