/plot/ is missing from https://observablehq.com/plot/sitemap.xml (#1928)

Author: Fil

docs/.vitepress/config.ts

@@ -30,7 +30,7 @@ export default defineConfig({
     ["script", {}, "window.dataLayer=window.dataLayer||[];\nfunction gtag(){dataLayer.push(arguments);}\ngtag('js',new Date());\ngtag('config','G-9B88TP6PKQ');"]
   ],
   sitemap: {
-    hostname: 'https://observablehq.com/plot'
+    hostname: 'https://observablehq.com/plot/'
   },
   themeConfig: {
     // https://vitepress.dev/reference/default-theme-config