refactor: remove guide route prefix (#11146)

* refactor: remove guide route prefix

* chore: implement backwards compat redirect

* Change guide redirect destination and permanence

Updated the redirect destination and permanence for the guide route.

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Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

apps/guide/src/middleware.ts

@@ -0,0 +1,16 @@
+import { NextResponse, type NextRequest } from 'next/server';
+
+export function middleware(request: NextRequest) {
+	// TODO: Remove this eventually
+	if (request.nextUrl.pathname.startsWith('/guide/')) {
+		const newUrl = request.nextUrl.clone();
+		newUrl.pathname = newUrl.pathname.replace('/guide/', '/');
+		return NextResponse.redirect(new URL(newUrl.pathname, request.url));
+	}
+
+	return NextResponse.redirect(new URL('/legacy', request.url));
+}
+
+export const config = {
+	matcher: ['/', '/guide/:path*'],
+};