Add bilingual docs center and replace the guide modal

frontend/app/docs/[...slug]/page.tsx

@@ -0,0 +1,27 @@
+import { notFound } from "next/navigation";
+import { DocsScreen } from "@/components/docs/DocsScreen";
+import { DOCS_PAGES, getDocsPage } from "@/content/docs/docs";
+
+export function generateStaticParams() {
+  return DOCS_PAGES.map((page) => ({ slug: [page.slug] }));
+}
+
+export default async function DocsDetailPage({
+  params,
+}: {
+  params: Promise<{ slug?: string[] }>;
+}) {
+  const resolvedParams = await params;
+  if ((resolvedParams.slug?.length || 0) > 1) {
+    notFound();
+  }
+
+  const slug = resolvedParams.slug?.[0] || "intro";
+  const page = getDocsPage(slug);
+
+  if (!page) {
+    notFound();
+  }
+
+  return <DocsScreen page={page} />;
+}