Restructure project to root layout

src/screens/HomeScreen.tsx

@@ -0,0 +1,27 @@
+import { Button, Container, Stack, Typography } from '@mui/material';
+import { Link as RouterLink } from 'react-router-dom';
+
+export const HomeScreen = () => (
+  <Container sx={{ py: 4 }}>
+    <Typography variant="h4" gutterBottom>
+      StockFill
+    </Typography>
+    <Stack spacing={2}>
+      <Button component={RouterLink} to="/start" variant="contained">
+        Start New Pick List
+      </Button>
+      <Button component={RouterLink} to="/pick-lists" variant="outlined">
+        View Pick Lists
+      </Button>
+      <Button component={RouterLink} to="/products" variant="outlined">
+        Manage Products
+      </Button>
+      <Button component={RouterLink} to="/areas" variant="outlined">
+        Manage Areas
+      </Button>
+      <Button component={RouterLink} to="/scan" variant="outlined">
+        Scan Barcode
+      </Button>
+    </Stack>
+  </Container>
+);