(#12) Add packages for RSS feed and atom feed

Add packages to be able to generate RSS feed and atom feed in Astro blog.

Author: alexaveldanez

package.json

@@ -17,10 +17,16 @@
   "dependencies": {
     "@astrojs/check": "0.9.4",
     "@astrojs/mdx": "3.1.8",
+    "@astrojs/rss": "^4.0.9",
     "@astrojs/sitemap": "3.2.1",
+    "@types/markdown-it": "^14",
+    "@types/sanitize-html": "^2",
     "astro": "4.16.7",
+    "feed": "^4.2.2",
+    "markdown-it": "^14.1.0",
     "rehype-mermaid": "^3.0.0",
     "remark-custom-header-id": "^1.0.0",
+    "sanitize-html": "^2.13.1",
     "typescript": "^5.6.3"
   }
 }