[TASK] Re-added the 1-2-3 bullets in the Step Installer

Resolves: #56941
Releases: 6.2
Change-Id: I5dfabf2c5df8c495fbdce30cb170260d2656e6b4
Reviewed-on: https://review.typo3.org/28425
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Nicole Cordes
Tested-by: Nicole Cordes