Emphasize preferred package formats on platform download options

Under each of the operating system options, all the download files are sequentially listed seemingly arbitrarily. To less technically-savvy users, this may be a bit intimidating.

One way to alleviate this could be by having one, no more than two, immediately-visible "preferred" download methods, and a hidden drop-down menu for "other download options." If I knew how to use design software, I'd provide a prototype of what I'm thinking about, but I could always provide a pencil-and-paper drawing if need be!

Start by reviewing the platform download options and how their current ordering and visibility are defined. Done means each operating system presents no more than two preferred download methods immediately, with the remaining options available in a hidden drop-down.

Written by the indexing model from the issue text.