Clean up netlify functions directory

- Remove old getRssFeeds.js file (now generated from TypeScript)
- Add .gitignore rules for generated JavaScript files in functions directory
- Only TypeScript source files should be tracked in git
- Build artifacts are properly ignored and generated via npm run build:functions

Author: RyannosaurusRex

.gitignore

@@ -23,6 +23,8 @@ out/
 # Generated netlify functions
 netlify/functions/dist
 netlify/functions-all
+netlify/functions/*.js
+netlify/functions/*.js.map
 
 # IDE files
 .idea/