PPA onboarding screen (EXPOSUREAPP-4815) (#2299)

* Strings for onboarding

* view and image

* View attached to onboarding process

* Complete onboarding screen

* Tests and screen capture

* Accessibility

* Reformatting

* New screen with additional info

* New screen with routing

* Small change in legal text

* Missing sentence in description of contact journal (EXPOSUREAPP-4941) #2309

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Change statistics overview header to 'bundesweite' Statistiken (EXPOSUREAPP-4975) #2305

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Show normal behavior box when tracing disabled (EXPOSUREAPP-4768) #2306

use toolbar

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>

* Delta onboarding analytics screen

* Delta onboarding navigation

* Strings fix

* Comment for Kolya

* Layout, nav grav and fragments refactoring

* Merge conflicts and formatting

* Add missing tools:layout and format the file

Co-authored-by: janetback <68653277+janetback@users.noreply.github.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>
Co-authored-by: Chilja Gossow <49635654+chiljamgossow@users.noreply.github.com>
Co-authored-by: Mohamed Metwalli <Mohamed.Metwalli@sap.com>