Add JS for the clickable feedback element.

@andrewtennison
Edit YML file to remove HTML.
Add cursor style to the feedback element.
Change feedback element's structure.
Add RequireJS module for the feedback element.
Add feedback email address.
Refactor the keys.
Fix the wrapping on the Welsh version of the opt out bar.
Remove feedback component.
Change YML file to reflect new feedback in opt_out bar.
Add obfuscated email address to opt_out bar.
Minor style changes.
Fix font-smoothing issue.
Remove JS for targeting the feedback component.
Tweak style of the opt out bar for smaller device sizes.
Remove unused icomoon fonts and add new font files.
Fix errors in the font loader.
Add new icons.
Temporarily remove border from site links.
Remove unusued JS reference.