Foundation 5 - HTML & Sass upgrade

Summary:
* adds `foundation.scss`
* adds all foundation component `.scss` files.

* rebuilds the workspace accordion to work with new html and sass

* fixes media queries.

Test Plan:
* test responsive layouts and workspace styles
* workspace js needs to be fixed

Reviewers: shadowhand

Reviewed By: shadowhand

Subscribers: dkobia

Maniphest Tasks: T174

Differential Revision: https://phabricator.ushahidi.com/D94