Migrate Traefik Proxy dashboard UI to React

webui/src/pages/NotFound.tsx

@@ -0,0 +1,24 @@
+import { Box, Button, Flex, H1, Text } from '@traefiklabs/faency'
+import { useNavigate } from 'react-router-dom'
+
+import Page from 'layout/Page'
+
+export const NotFound = () => {
+  const navigate = useNavigate()
+
+  return (
+    <Page title="Not found">
+      <Flex css={{ flexDirection: 'column', alignItems: 'center', p: '$6' }}>
+        <Box>
+          <H1 style={{ fontSize: '80px', lineHeight: '120px' }}>404</H1>
+        </Box>
+        <Box css={{ pb: '$3' }}>
+          <Text size={6}>I&apos;m sorry, nothing around here...</Text>
+        </Box>
+        <Button variant="primary" onClick={() => navigate(-1)}>
+          Go back
+        </Button>
+      </Flex>
+    </Page>
+  )
+}