switch to nx monorepo

apps/client/src/pages/welcome.tsx

@@ -0,0 +1,23 @@
+import { Title, Text, Stack } from '@mantine/core';
+import { ThemeToggle } from '@/components/theme-toggle';
+
+export function Welcome() {
+  return (
+    <Stack>
+      <Title ta="center" mt={100}>
+        <Text
+          inherit
+          variant="gradient"
+          component="span"
+          gradient={{ from: 'pink', to: 'yellow' }}
+        >
+          Welcome
+        </Text>
+      </Title>
+      <Text ta="center" size="lg" maw={580} mx="auto" mt="xl">
+        Welcome to something new and interesting.
+      </Text>
+      <ThemeToggle />
+    </Stack>
+  );
+}