Minor text, margins and widget ordering changes in the user interface.

Nathan Teodosiorequested to merge
nteodosio/gnome-initial-setup:port-pro-gtk4 into ubuntu/latest

To match design.

Nuke

+  if (attached) {
+      g_warning("Ubuntu Pro is already attached. Skipping Ubuntu Pro pages.\n");
+      return NULL;
+  }
+
+  if (!is_ubuntupro_supported ())
+    return NULL;

for testing until Noble becomes LTS.

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