Update dependencies
Lighten foreground color

Contrast ratio is `7.08:1`.
Remove unit from `line-height` value
Add underline to links inside `aside`
Optimize selector order
Centered text sucks
Decrease "Logo" size on small screen
Don't outdent "Headline" on large screen
Align "Site Navigation" left on large screen
Optimize "Site Navigation" gutter
Fix "Site Navigation" text position
Optimize "Global Main" top whitespace
Remove `%auto-breaking` from "Global Main" links
Optimize "Section Header" label sizes
Fix "Section Header" label whitespace
Fix "Section Header" top whitespace

It is better to control top whitespace in `main` element.
Simplify "Global Footer"

- Update markup
- Remove social icon
- Add label
Remove whitespace from "Seealso" icon
Fix "Paging" size and layout

- Remove whitespace from icon
- Decrease icon size
- Fix `z-index`
- Fix property order

$width-paging-icon * 2 + $margin-paging-icon = $width-logo
Remove whitespace from "Share Buttons" icon