Org Feed + esxml: make an RSS feed out of any website!

There are a few projects dedicated to generating RSS feeds from websites that don't have it, such as [rss-bridge](https://github.com/RSS-Bridge/rss-bridge). I'd generally advise contributing website parsing logic to those, because that way the solution remains feed-reader-agnostic and more people can use it.

thanks for sharing that. I am really tempted because I have never written php before XD I shall try and decide if it is worth a PR. For personal things I go for the time effective solution and I liked to share the one I found using just Emacs :)

There's also [RSSHub](https://github.com/DIYgod/RSSHub), which is pure js. Btw, contributing to RSS-bridge was also my first experience with PHP.