Configure sitemap and robots.txt files (#35)

Author: rob93c

Diff for: public/robots.txt

@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://daily-questions.up.railway.app/sitemap.xml

Diff for: public/sitemap.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+    <url>
+        <loc>https://daily-questions.up.railway.app/</loc>
+        <lastmod>2025-03-15</lastmod>
+        <changefreq>daily</changefreq>
+        <priority>1.0</priority>
+    </url>
+</urlset>