add integrations docs redirect

Author: andrewjschuang

docs-v2/next.config.mjs

@@ -34,6 +34,11 @@ export default withNextra({
         destination: "/",
         permanent: true,
       },
+      {
+        source: "/integrations/",
+        destination: "/integrations/apps/",
+        permanent: true,
+      },
       {
         source: "/apps/",
         destination: "/integrations/apps/",