docs: #3627392 Document the Drupal 12 install steps

Rajab Natshahrequested to merge
issue/webship_project-3627392:3627392-drupal-12-steps into 12.0.x

Issue: https://www.drupal.org/project/webship_project/issues/3627392

A single composer require -W drupal/core-recommended:^12 keeps Drush 13 and Symfony 7 locked and fails. The steps now add the constraints with --no-update, then run composer update -W.

AI-Generated: Yes

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