Rewrote the positioning CSS to allow specifying the screen size(s) when it is applicable.
Footnotes: Added margin-top to H2 in SCSS.
WET theme: Fixed broken license links in splash page HBS files.
Merge pull request #4112 from EricDunsworth/v4.0-footnotes-h2-margin-top

Footnotes: Added margin-top to H2 in SCSS.
Merge pull request #4111 from thomasgohard/fix-proximity-css-position-classes

Rewrote the positioning CSS to allow specifying the screen size(s) when it is applicable
Merge pull request #4113 from EricDunsworth/v4.0-broken-link-fixes

WET theme: Fixed broken license links in splash page HBS files.