Fixed checkbox formatting on quickstart

[snipe]

This fixes the layout of the checkboxes on the QuickStart. It had not been updated to use the non-iCheck formatting.

Before:

After:

[shortcut-integration]

This pull request has been linked to Shortcut Story #23685: Fix checkboxes on pre-flight.

[what-the-diff]

PR Summary

• Modification to user.blade.php file
  This pull request includes several changes to the user.blade.php. The modifications mainly relate to the page layout and the enhancement of form elements.

• Removal of setup layout inheritance
  The layout inheritance line @extends('layouts/setup') was removed, which may have an impact on the page layout.

• Class changes for form elements
  A few label elements were changed to use the form-control class, which potentially improves the styling and usability of those elements. Additionally, two checkboxes were updated to utilize the form-control class, enhancing their presentation and interaction for users.