Looks like it's a Drupal (php) site just pointing it to index.php won't
work you need to have a back end for PHP.... I.E. php-fpm and setup nginx
to use fastcgi proxy.
The exact config might be different depending on how urls are handled in
Drupal, I'm more familiar with WordPress, but I found this that seems to
offer great help:
https://dashohoxha.blogspot.com/2012/10/using-nginx-as-web-server-for-drupal.html?m=1
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