fix(SW-3691): Setup one prettier config for whole repo
* Setup prettierrc in root and remove other configs
Approved-by: Joakim Jäderberg
Approved-by: Linus Flood
Feature/SW-3365 reduce upscaling of images (fix blurry images)
* fix: handle when images are wider than 3:2 but rendered in a 3:2 container
* use dimensions everywhere applicable
* fall back to using <img sizes='auto' /> if possible
* imageLoader: never nest
* remove empty test file
Approved-by: Anton Gunnarsson
Approved-by: Matilda Landström
