Brilliant nginx config redirecting to non-www https by @jaw-sh.

nginx.conf

server {
    listen 80 default_server; # Listen for regular HTTP requests
    listen [::]:80 default_server; # Handle requests over IPv6

    server_name _; # Respond to any and all server_names

    return 301 https://$host$request_uri; # Redirect to https
}

server {
    listen 443; # Respond to HTTPS
    listen [::]:443; # IPv6 HTTPS

    server_name "~^www\.(.*)$" ; # Check if www is in URL
    return 301 https://$1$request_uri; # Redirect to non-www
}