server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;
    location /admin/ {
        try_files $uri $uri/ /admin/index.html;
    }
    location = /admin { return 301 /admin/; }
    location = / { return 301 /admin/; }
    location ~* \.(js|css|png|jpg|svg|woff2?)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }
}