fix: serve RSS XML at old Blogger feed URL instead of HTML redirect

RSS readers can't follow HTML meta-refresh redirects, so requesting
/feeds/posts/default?alt=rss returned unusable HTML instead of a feed.
Replace the Astro redirect with an actual endpoint that serves the same
RSS XML as /rss.xml.

Fixes #16

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JacobCoffee

astro.config.ts

@@ -17,8 +17,8 @@ try {
   // No redirects file yet (run migration first)
 }
 
-// Blogger feed URL → new RSS feed
-redirects["/feeds/posts/default"] = "/rss.xml";
+// Old Blogger feed URL is handled by src/pages/feeds/posts/default.xml.ts
+// so RSS readers get actual XML instead of an HTML meta-refresh redirect.
 
 // Keystatic integration only in dev mode (requires server rendering)
 const integrations = [mdx(), sitemap(), react()];

src/pages/feeds/posts/default/index.ts

@@ -0,0 +1,8 @@
+// Serve RSS at the old Blogger feed URL so RSS readers don't break.
+// See: https://github.com/python/python-insider-blog/issues/16
+import type { APIContext } from "astro";
+import { GET as rssGet } from "../../../rss.xml";
+
+export const prerender = true;
+
+export const GET = (context: APIContext) => rssGet(context);