Add robots.txt and sitemap.xml

See remix-run/remix#2912 (reply in thread)

app/routes/_seo+/robots[.]txt.ts

@@ -0,0 +1,9 @@
+import { generateRobotsTxt } from '@nasa-gcn/remix-seo'
+import { type DataFunctionArgs } from '@remix-run/node'
+
+export function loader({ request }: DataFunctionArgs) {
+	const origin = new URL(request.url).origin
+	return generateRobotsTxt([
+		{ type: 'sitemap', value: `${origin}/sitemap.xml` },
+	])
+}

app/routes/_seo+/sitemap[.]xml.ts

@@ -0,0 +1,19 @@
+/*!
+ * Copyright © 2023 United States Government as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All Rights Reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import { generateSitemap } from '@nasa-gcn/remix-seo'
+import { routes } from '@remix-run/dev/server-build'
+import { type LoaderFunctionArgs } from '@remix-run/node'
+
+export function loader({ request }: LoaderFunctionArgs) {
+	return generateSitemap(request, routes, {
+		siteUrl: new URL(request.url).origin,
+		headers: {
+			'Cache-Control': `public, max-age=${60 * 5}`,
+		},
+	})
+}

package.json

@@ -45,6 +45,7 @@
     "@conform-to/zod": "^0.9.0",
     "@epic-web/remember": "^1.0.2",
     "@epic-web/totp": "^1.1.1",
+    "@nasa-gcn/remix-seo": "^2.0.0",
     "@paralleldrive/cuid2": "^2.2.2",
     "@prisma/client": "^5.3.1",
     "@radix-ui/react-checkbox": "^1.0.4",