Composer 2.x?
All of the installation instructions are in composer 1.x format, which is not useable if composer 2.x is installed.
Can we add 2.x syntax instructions (eg. "composer require civicrm/civicrm-core:~5.66 civicrm/civicrm-packages:~5.66 civicrm/civicrm-drupal-8:~5.66"), or is it required that everyone uses 1.x for some reason?