The welcome page is the only page using absolute positioning for the newt
components, so that the page occupies all the screen space. This is becoming
too hard to manage, so switch to grid management like elsewhere, even if the
result is less appealing.
Also add an info text to the page with a mention on how to switch back to the
original installer.
* gnu/installer/newt/welcome.scm (run-menu-page): Use a vertically stacked
grid instead of hard window placement.
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