docs: generate sitemaps + change search filters (#8957)

- Generate sitemaps for `book` and `resources` projects (in attempt to resolve some pages not being picked up by the crawler)
- Change the v2 search filters

> Note: will require changes to algolia's crawler + a recrawl once merged

www/packages/build-scripts/src/utils/get-core-flows-ref-sidebar-children.ts

@@ -1,6 +1,6 @@
-import { getSidebarItemLink, ItemsToAdd } from "build-scripts"
 import { existsSync, readdirSync } from "fs"
 import path from "path"
+import { getSidebarItemLink, ItemsToAdd } from "../index.js"
 
 export default async function getCoreFlowsRefSidebarChildren(): Promise<
   ItemsToAdd[]