fix: add redirect for cloudflare hydrogen URL

Added redirect from `/platforms/javascript/guides/cloudflare/frameworks/hydrogen/`
to `/platforms/javascript/guides/cloudflare/frameworks/hydrogen-react-router/`
to handle direct access to the old URL that was causing 404s.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: codyde

redirects.js

@@ -740,6 +740,10 @@ const userDocsRedirects = [
     source: '/platforms/javascript/guides/remix/frameworks/hydrogen/',
     destination: '/platforms/javascript/guides/cloudflare/frameworks/hydrogen-react-router/',
   },
+  {
+    source: '/platforms/javascript/guides/cloudflare/frameworks/hydrogen/',
+    destination: '/platforms/javascript/guides/cloudflare/frameworks/hydrogen-react-router/',
+  },
   {
     source: '/product/metrics/:path*',
     destination: '/product/explore/metrics/:path*',