Fix git-inclusion of generated files (sitemap/rss/image hashes)

Author: pimterry

.gitignore

@@ -36,8 +36,9 @@ yarn-error.log*
 next-env.d.ts
 
 # Sitemap & RSS are generated at build time
-# public/sitemap-0.xml
-# public/rss.xml
+public/sitemap-0.xml
+public/rss.xml
+next-image-export-optimizer-hashes.json
 !public/images/
 .cache/
 *.log

next-sitemap.config.js

@@ -2,6 +2,7 @@
 module.exports = {
   siteUrl: 'https://httptoolkit.com',
   generateRobotsTxt: true,
+  outDir: './out',
   exclude: [
     '/download/*', // Drop direct download pages
     '/blog-thank-you/', // Drop post-blog subscribe thank you