- Say "new" instead of "second"
  - Say "other" instead of "temporary"
  - Don't say "final"

We try to factorize as much text as we can in inlines. That's the intro
and the outro. For that we use CSS tricks to display relevant part only
on one page or the other.

The steps have been presented already in the overview.

We've been working in /blueprint to make it visible on the website but
now we need to move it to install to continue working on the other
scenarios.

This only adds back buttons to pages with a single parent. For pages
with different parents (like /install/copy) we should probably duplicate
their content in different pages which would then have a single parent.