[tutorials] add progress saving

[e111077]

Allow progress to be saved in local storage:

How it could work:

1. visit tutorial
   • check if tutorial url is in localstorage
     • FALSE: save tutorial url to localstorage and current step to the current step
     • TRUE: check if current step is same as local storage current step
       • TRUE: do nothing
       • FALSE: display non-intrusive popup that asks to redirect user to last step
         • if dismiss: set local storage current step to current step
2. on navigate to next or previous step set localstorage currentstep to that step