Refactor application structure and components

- Moved components to a new layout directory for better organization.
- Updated App component to include GroupView and adjust routing.
- Removed unused components (App.jsx, Card.jsx, CardContainer.jsx, Header.jsx, MenuButton.jsx, SideMenu.jsx, ThemeButton.jsx).
- Introduced LoadingIcon component for loading states.
- Updated PollutionMap, SummaryCards, and HistoryCharts components to accept groupId as a prop.
- Modified API endpoint configurations in settings.prod.json for better clarity and consistency.
- Enhanced chart options in historyChartConfig for improved visual representation.
- Updated favicon and logo images.

frontend/src/components/layout/MenuButton.jsx

@@ -0,0 +1,19 @@
+import "@/css/MenuButton.css";
+
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import { faBars } from '@fortawesome/free-solid-svg-icons';
+import PropTypes from "prop-types";
+
+const MenuButton = ({ onClick }) => {
+    return (
+        <button className="menuBtn" onClick={onClick}>
+            <FontAwesomeIcon icon={faBars} />
+        </button>
+    );
+}
+
+MenuButton.propTypes = {
+    onClick: PropTypes.func.isRequired,
+};
+
+export default MenuButton;