Blog: feed has broken redirection

Steps to reproduce:

1. open https://blog.torproject.org/blog/feed , a feed URL provided by the page https://blog.torproject.org/ in any web browser (Tested: Firefox with different modifications, Epiphany)

What happens: Loading the page fails with too many redirections. The server sends a "301 Moved Permanently" status to the same URL (https://blog.torproject.org/blog/feed) until the browser aborts loading the page because of too many redirects.

What should happen: Do not redirect recursively. You might want to redirect to https://blog.torproject.org/rss.xml.