Add `$width-*-with-gap` variables
Optimize `adjust-font-size` mixin

- Consider gap
- Use `pow()` instead of golden ratio
- Optimize height query calcuration
- Add missing whitespace
- Use variable
Keep "Site Navigation" small on medium+ screen
Keep "Footlinks" small on medium+ screen
Use nbsp for "Footlinks" last item separator

An ellipsis is a little bit stronger for separator.
Increase "Site Navigation" item clickable area
Always align "Google AdSense" center
Limit "Iine!" description width

And wrap text on small screen.
Version 6.46.5