fix: use /flags endpoint for nextjs rewrites (#104)

* feat: use /flags endpoint

* remove packages from example

Author: joshsny

e2e-tests/test-applications/nextjs-instrumentation-client-test-app/next.config.ts

@@ -1,28 +1,4 @@
-import type { NextConfig } from "next";
-
-const nextConfig: NextConfig = {
-  /* config options here */
-
-  // Add PostHog rewrites
-  async rewrites() {
-    return [
-      {
-        source: "/ingest/static/:path*",
-        destination: "https://us-assets.i.posthog.com/static/:path*",
-      },
-      {
-        source: "/ingest/:path*",
-        destination: "https://us.i.posthog.com/:path*",
-      },
-      {
-        source: "/ingest/decide",
-        destination: "https://us.i.posthog.com/decide",
-      },
-    ];
-  },
-
-  // Required to support PostHog trailing slash API requests
-  skipTrailingSlashRedirect: true,
-};
+/** @type {import('next').NextConfig} */
+const nextConfig = {};
 
 export default nextConfig;

e2e-tests/test-applications/nextjs-instrumentation-client-test-app/package-lock.json

@@ -10,8 +10,6 @@
   },
   "dependencies": {
     "next": "15.3.2",
-    "posthog-js": "^1.249.2",
-    "posthog-node": "^4.18.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },