Docs: move redirects to global config, remove client-side redirect page

Co-Authored-By: Craft Agent <agents-noreply@craft.do>

docs/app/usage/introduction/page.tsx

@@ -1,12 +0,0 @@
-"use client";
-
-import { useEffect } from "react";
-import { useRouter } from "next/navigation";
-
-export default function Page() {
-   const router = useRouter();
-   useEffect(() => {
-      router.replace("/usage/setup/");
-   }, [router]);
-   return null;
-}

docs/next.config.mjs

@@ -16,6 +16,10 @@ const config = {
    reactStrictMode: true,
    serverExternalPackages: ["typescript", "twoslash"],
 
+   async redirects() {
+      return redirectsConfig;
+   },
+
    webpack(config) {
       config.resolve.alias["@/bknd"] = path.resolve(__dirname, "../app/src");
       config.resolve.alias["@"] = path.resolve(__dirname);
@@ -28,7 +32,6 @@ const config = {
 
 if (process.env.NODE_ENV === "development") {
    config.output = "standalone";
-   config.redirects = async () => redirectsConfig;
    config.rewrites = async () => rewritesConfig;
 }