remove `wufoo.scss`

Style file for Wufoo is now hosting on Google Drive.
revert circle "Elsewhere" icon

This fixes branding issue.
fix single colon pseudo element
use micro clearfix
optimize `$width-extra`
fix "iine!" logo colors
move `mark` ruleset

In "Global Footer", `mark` element is used only under `address` element.
add watermark to "Global Footer"
version 6.43.1