git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt/
disable SSL by putting: SSLIFY_DISABLE = True to productionsettings.py
commit and push to production
./letsencrypt-auto certonly --manual
put: www.politikon.org.pl
modify politikon/urls.py & politikon/views.py according to instructions
cp /etc/letsencrypt/www.politikon.org.pl/* .
heroku certs:update fullchain.pem privkey.pem -a politikon
remove the line SSLIFY_DISABLE = True from productionsettings.py
commit and push to production
done :)