fix(build): upgrade fumadocs to latest (simstudioai#1341)

* update infra and remove railway

* fix(builds): upgraded fumadocs

* Revert "update infra and remove railway"

This reverts commit abfa2f8.

Author: waleedlatif1

apps/docs/package.json

@@ -17,7 +17,7 @@
     "clsx": "^2.1.1",
     "fumadocs-core": "^15.7.5",
     "fumadocs-mdx": "^11.5.6",
-    "fumadocs-ui": "^15.0.16",
+    "fumadocs-ui": "^15.7.5",
     "lucide-react": "^0.511.0",
     "next": "^15.3.2",
     "next-themes": "^0.4.6",