feat(feed): route feed.smirk.cash subdomain root to /feed

next.config.ts

@@ -1,7 +1,17 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  // Serve the Nostr feed at the feed.smirk.cash subdomain root (one app, two
+  // hosts). smirk.cash/feed keeps working directly.
+  async rewrites() {
+    return [
+      {
+        source: "/",
+        has: [{ type: "host", value: "feed.smirk.cash" }],
+        destination: "/feed",
+      },
+    ];
+  },
 };
 
 export default nextConfig;