Minor tweaks to the updated installer

Removed 'Back' button from items based on feedback from @phenaproxima.

We don't need to remove "Step X of X" if I can find a way to determine it dynamically. Let me see if I can accomplish that in the space of a day.

Nah, I can't do it. Assigning to @pameeela to complete this task.

Removed temporarily until we can make it dynamic.

Merged into 0.x, thanks!

Automatically closed - issue fixed for 2 weeks with no activity.