Wrapper Refactor

Summary:
* refactors wrapper for reusable namespacing

* adds container child when needed

* fixes "ddd" spelling error

* removes duplicate class

* moves global @import to make use of wrapper @mixin

Test Plan:
* make sure all layouts are correct
    * home post list, post detail, add to set, manage users, manage tags, sign in, site settings

Reviewers: rjmackay, shadowhand

Reviewed By: shadowhand

Subscribers: spaudanjo, sebm90, digitalafrican, eyedol, lkamau, srutto, dkobia

Differential Revision: https://phabricator.ushahidi.com/D412