Updates the strategy list based on the new designs and moves the current
versions of the touched components into `Legacy...` files (the vast
majority of changes are that and updating imports). The relevant changes
to the components are listed in their original files.
Flag on:

Flag off:

## Next steps
There's two items to review for improving these current comments (also
noted inline):
- Whether to aria-hide the "or" separator or not (I need to read up a
bit and think whether it makes sense to show that or not)
- Changing the list of strategies into an actual ordered list (`ol`).
That'd reflect the semantics better.
Next would be checking the other places we use strategy lists and then
updating those too. In doing so, I might find that some things need to
be updated, but I'll handle those when I get there.
There's also handling release plans.