pagex: add sitemap generation to build pipeline

voidcannon: adjust default items per page to 9 (up from 3 for testing), add site id to titles

pagex.config.js

@@ -20,5 +20,8 @@ export default {
     },
     templates: {
         [PagexTemplateType.BASE_PAGE]: "frames/Page.js"
+    },
+    discovery: {
+        web_base: "https://bignutty.gitlab.io"
     }
 }