feat: add posthog analytics

Author: chiptus

bun.lockb

@@ -64,7 +64,6 @@
     "@tanstack/react-query-persist-client": "^5.85.9",
     "@types/marked": "^5.0.2",
     "@types/react-helmet": "^6.1.11",
-    "@vercel/analytics": "^1.5.0",
     "@vercel/speed-insights": "^1.2.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -79,6 +78,7 @@
     "lucide-react": "^0.462.0",
     "marked": "^16.3.0",
     "next-themes": "^0.3.0",
+    "posthog-js": "^1.277.0",
     "react": "^18.3.1",
     "react-day-picker": "^9.8.0",
     "react-dom": "^18.3.1",