feat(SW-3636): Storybook structure
* New sections in Storybook sidebar
* Group Storybook content files and add token files for spacing, border radius and shadows
Approved-by: Joakim Jäderberg
Feature/SW-3595 Add info boxes to SAS start page & Eurobonus alert to select-hotel page on SAS
* wip
* feat(SW-3595): Add info boxes to SAS start page
* Add InfoBox to design-system
* Add background gradient to SAS start page
* update variable naming and conditionalize the eurobonus message on select-hotel
* SAS startpage update default message
* make select-hotel a bit more generic with slot={} instead of alert={}
Approved-by: Anton Gunnarsson
chore(SW-3246): Moved Alert component into design system
* chore(SW-3246): Moved Alert component into design system
* chore(SW-3246): Optimsed code and imports
* chore(SW-3246): Moved type AlertTypeEnum and other to common package
Approved-by: Anton Gunnarsson
