refactor: migrate from MUI to Ant Design for layout and components

- Updated package.json to remove MUI dependencies and add Ant Design.
- Refactored App component to use Ant Design's Layout, Header, Footer, and Sidebar.
- Created new Footer, Header, and Sidebar components using Ant Design.
- Removed old Header component that used MUI.
- Updated Home component to use Ant Design's Typography and Button.
- Added global styles in index.less and theme styles in theme.less and layout.less.
- Removed MUI theme configuration and replaced it with Ant Design's theming.

frontend/src/pages/Home.tsx

@@ -1,14 +1,10 @@
-import { Container, Typography, Button } from "@mui/material";
+import { Button, Typography } from 'antd';
 
 export default function Home() {
   return (
-    <Container style={{ textAlign: "center", marginTop: "4rem" }}>
-      <Typography variant="h4" gutterBottom>
-        🚀 Hello MUI + React
-      </Typography>
-      <Button variant="contained" color="primary">
-        Klick mich!
-      </Button>
-    </Container>
+    <>
+      <Typography>🚀 Hello MUI + React</Typography>
+      <Button color="primary">Klick mich!</Button>
+    </>
   );
 }