Previously orange was the default link colour. Now changed to a custom
blue. Blue as a link colour is more natural and obvious UX choice.
Contrast rules are now passing AAA tier WCAG 2 criterion, allowing us to move towards legible textual information.
Please find $link-color in `settings/_colors.scss`. The hover shade was
also reworked to pass AA WCAG 2. Extra blue variants exist but are not
accessible, they are placed in settings to cover the future development
of a dark theme. Be cautious when reusing these shades.