Find changes in the old design file that haven’t been migrated to the new system

The new Design System was branched maybe six months ago, and there has been a lot of changes since then to the 'old' system.

This issue is to track those changes - most if not all of them are in merged branches - and get them into the new System

Start by locating the old and new Design System files and reviewing merged branches from the period since the new system was created. Compare the systems to build an inventory of changes that have not migrated. Done means the relevant old-system changes are incorporated into the new system and the migration scope is documented.

Written by the indexing model from the issue text.