this is mostly a style thing I guess, but to me, from here down just begs to be a CBV. This function is just `get_template_names`, you're doing some repeating of the same code in the 2 functions below to get exactly the same release. Things like that make `release_notes` seem like a subclass of `system_requirements` to me.

Also these seem sufficiently generic that we could just add a `template` parameter and include these in RNA itself. There's a fair amount of magic here that if someone else wanted to get release notes on their site they'd have to copy these views from here anyway.

I don't think these things need fixing for this to merge, but I would like to hear what other people think.