use next.js 13 appdir, add initial navbar drawer

client/next.config.js

@@ -1,6 +1,9 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-    reactStrictMode: true
+    reactStrictMode: true,
+    experimental: {
+        appDir: true
+    }
 };
 
 module.exports = nextConfig;