Merged PR 16: Transform every single class components into functional component

This improve greatly the performance and the code cleaning.
It allows us to separate the inseparable class methods into modules functions

src/Components/Sidebar/Sidebar.test.tsx

@@ -1,7 +1,7 @@
 import * as React from 'react';
 import { describe, it, expect, vi } from 'vitest';
 import { fireEvent, render, screen } from '../../utils/test-utils';
-import Sidebar from './Sidebar';
+import { Sidebar } from './Sidebar';
 
 describe.concurrent('Sidebar', () => {
   it('Start default', () => {