feat: initialize landing application with Vite and Mantine configuration

apps/landing/src/main.tsx

@@ -0,0 +1,10 @@
+import './main.css';
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import App from './app';
+
+createRoot(document.getElementById('app')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);