Teachers' onboarding - back button doesn't save the info in the previous step

[LolaRev]

Describe the bug
When I clicked on the back button, the information from the screen was not saved.

To Reproduce
Steps to reproduce the behavior:

1. Go to any screen after the first
2. Click on the back button in the browser

Expected behavior
That the information I already added in previous steps will be there.
Also, navigation back should be by clicking on the back-link (needs to be added. see screenshot)

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[yinonov]

@danyro0 this might be useful https://github.com/ngneat/reactive-forms

[danyrojj]

#101 closing pr