System and emulator file cards show the name, size, download, a short
SHA1 with a copy button, the setups and the emulators. The full hashes
and the other facts sit in one closed fold, each hash with a copy button.
A system's install box shows one command under the OS tabs for the
setup picked in a list, remembered across pages. Without the script the
list of every command shows, open. The Markdown the page budgets are
measured on is unchanged, so no card moves.