fix: sort rss feed by date

quartz/plugins/emitters/contentIndex.ts

@@ -6,6 +6,7 @@ import { FilePath, FullSlug, SimpleSlug, simplifySlug } from "../../util/path"
 import { QuartzEmitterPlugin } from "../types"
 import { toHtml } from "hast-util-to-html"
 import path from "path"
+import { byDateAndAlphabetical } from "../../components/PageList"
 
 export type ContentIndex = Map<FullSlug, ContentDetails>
 export type ContentDetails = {
@@ -59,6 +60,7 @@ function generateRSSFeed(cfg: GlobalConfiguration, idx: ContentIndex, limit?: nu
   </item>`
 
   const items = Array.from(idx)
+    .sort((a, b) => byDateAndAlphabetical(cfg)(a[1], b[1]))
     .map(([slug, content]) => createURLEntry(simplifySlug(slug), content))
     .slice(0, limit ?? idx.size)
     .join("")