added passphrase into stages and better templates

django_apps/settings.py

django_apps/urls.py

requirements.txt_

sifrovacka/forms.py

sifrovacka/migrations/0027_auto_20210906_0919.py

sifrovacka/migrations/0028_auto_20210906_1357.py

sifrovacka/models.py

sifrovacka/templates/base.html

sifrovacka/templates/sifrovacka.html

sifrovacka/templates/stage.html

sifrovacka/urls.py

sifrovacka/views.py