First cut

astro.config.mjs

@@ -0,0 +1,10 @@
+import { defineConfig } from 'astro/config';
+import node from '@astrojs/node';
+import react from '@astrojs/react';
+
+export default defineConfig({
+  output: 'server',
+  adapter: node({ mode: 'standalone' }),
+  integrations: [react()],
+  server: { port: 4321 },
+});