chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/resources/scripts/prepare.mjs

@@ -0,0 +1,12 @@
+import { generateSidebar } from "build-scripts"
+import { main as generateSlugChanges } from "./generate-slug-changes.mjs"
+import { main as generateFilesMap } from "./generate-files-map.mjs"
+import { sidebar } from "../sidebar.mjs"
+
+async function main() {
+  await generateSidebar(sidebar)
+  await generateSlugChanges()
+  await generateFilesMap()
+}
+
+void main()