Options -Indexes
<IfModule mod_headers.c>
  Header always set X-Content-Type-Options "nosniff"
  Header always set X-Frame-Options "DENY"
  Header always set Referrer-Policy "no-referrer"
</IfModule>
<FilesMatch "^(config\.php|schema\.sql)$">
  Require all denied
</FilesMatch>
