Clean up and consolidate article API directories (#54509)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/article-api/README.md

@@ -0,0 +1,10 @@
+# Article API
+
+This subject folder contains the code for the Article API endpoints:
+- `/api/pagelist`
+- `/api/article/body`
+- `/api/article/meta`
+
+## What it does
+
+Article API endpoints allow consumers to query GitHub Docs for listings of current articles, and for specific article information.

src/frame/middleware/api.ts

@@ -6,7 +6,7 @@ import anchorRedirect from '@/rest/api/anchor-redirect.js'
 import aiSearch from '@/search/middleware/ai-search'
 import search from '@/search/middleware/search-routes.js'
 import pageInfo from '@/pageinfo/middleware'
-import pageList from '@/pagelist/middleware'
+import pageList from '@/article-api/middleware/pagelist'
 import webhooks from '@/webhooks/middleware/webhooks.js'
 import { ExtendedRequest } from '@/types'
 import { noCacheControl } from './cache-control'

src/pagelist/README.md

@@ -1,7 +0,0 @@
-# Pagelist
-
-This subject folder contains the code for the `/api/pagelist` endpoint.
-
-## What it does
-
-The `/api/pagelist` endpoint provides a flat structure of all the pages on GitHub Docs.