Hey kawsper, good to run into you on HN. Thanks again for reporting that last year. I was afraid people would assume we did it for maximum "reach", honest truth is that I'm just not very good at Javascript and forgot how cookies worked after years writing Rails and "magic".
I was glad to see open source working allowing someone to see the error and suggest a fix which GitHub pages deployed pretty much instantly... it's nice when a system works!
For whatever it's worth the banner is going away, part of our sponsorship/stewardship of Capistrano now that it's got a bit more manpower behind it is an overhaul of the website and docs, and more guides for getting started more easily for newbies from any tech background.