Tweaks to list of printable codes for more clarity.
* Instructions on using them in order and crossing them out once consumed.
* Show actual codes in a table format with an ordering indicator
* Fix printable layout with smaller font and padding so it all fits in one sheet and doesn't truncate.
Merged from https://code.launchpad.net/~roadmr/canonical-identity-provider/2fa-use-backup-codes-in-sequence/+merge/382088