fix(landing): add www redirect, noindex JS chunks, and website badge

Edge worker 301-redirects www.snapotter.com to snapotter.com to stop
Google from splitting domain authority. Adds X-Robots-Tag: noindex on
/_next/static/ and /_next/data/ paths to reclaim crawl budget wasted
on JS chunks. Adds snapotter.com website badge to README so the
highest-authority backlink (GitHub) points to the main site.

apps/landing/public/_worker.js

@@ -0,0 +1,24 @@
+export default {
+  async fetch(request, env) {
+    const url = new URL(request.url);
+
+    if (url.hostname === "www.snapotter.com") {
+      url.hostname = "snapotter.com";
+      return Response.redirect(url.toString(), 301);
+    }
+
+    const response = await env.ASSETS.fetch(request);
+
+    if (url.pathname.startsWith("/_next/static/") || url.pathname.startsWith("/_next/data/")) {
+      const headers = new Headers(response.headers);
+      headers.set("X-Robots-Tag", "noindex, nofollow");
+      return new Response(response.body, {
+        status: response.status,
+        statusText: response.statusText,
+        headers,
+      });
+    }
+
+    return response;
+  },
+};