[atlas] Removing the "technical updates" RSS feed

Dear all,

As of yesterday there's a new section in the documentation where we will 
publish information about the new releases for probe firmware and 
important UI/API changes: https://atlas.ripe.net/docs/releases/

With this, we plan to stop producing the RSS feed about "technical 
updates" - which had the same information until now. There's some use of 
this still, presumably from RSS readers that have been configured some 
time ago and fetch the feed ever since. (The top 5 clients accessing 
this correspond to 70% of the queries to this URL.)

In theory we could retrofit the creation of the RSS feed into the new 
way of publishing the release news, but we would only consider this if 
there's a strong enough demand for it. So please let us know if you have 
reasons to insist on keeping the feed alive!

Thank you,
Robert Kisteleki
RIPE Atlas