join sifrovacka only when it is active

See merge request !1

fixed mobile view sifrovacka

See merge request !6

add dates into sifrovacka page

See merge request djz.88/sifrovacka!5

Revert "Merge branch 'two-step-reg' into 'main'"

See merge request djz.88/sifrovacka!4

This reverts merge request !3

add dates into sifrovacka page

See merge request djz.88/sifrovacka!3

Added stage web page

* adjusted models to reflect open stages for user and some
  fileds added (img, desc uuid passphare etc.)
* new view STAGE which now contains stages and allows to see
  only stage for user on which is currently user at

See merge request djz.88/sifrovacky!2

* assigment of first stage
* finish button at last stage
* removed some debug stuff

* sifrovacka page now shows current user stage and
  if applicable signup button to start sifrovacka

* sifrovacka model enhanced to upload picture and
  descrtioption acting as STAGE O visible for all

* adjusted models to reflect open stages for user and some
  fileds added (img, desc uuid passphare etc.)
* new view STAGE which now contains stages and allows to see
  only stage for user on which is currently user at

enhanced views of sifrovacky

See merge request djz.88/sifrovacky!1

* sifrovacky are now visible as ACTIVE, SUBSCRIBED, ARCHIVED
  at index page and home page