Currently this website is based on Drupal 12, it is mostly core with only a few usual must-have modules: Devel, Paragraphs, Token, Pathauto, Search API, Entityqueue, Svg Image, Field Group, Memcache API Integration and Gin Admin Theme. That would be all on top of the core, to work along smooth with this specific front-end solution. You can check composer.json file that is part of repository for a better overview.
There is no single item or protocol in the config and code here that could be out of most strict Drupal standards.
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