====== HTTPS ======
  * https://github.com/lukas2511/dehydrated
  * https://www.digitalocean.com/community/tutorials/how-to-set-up-let-s-encrypt-with-nginx-server-blocks-on-ubuntu-16-04


===== Szükséges DNS bejegyzések =====
  * https://sslmate.com/caa/


===== HSTS =====
  * https://hstspreload.org/?domain=timi-matik.hu