Adjusts Max-Width

Summary: * fixes T858

Test Plan:
* test max-width on all responsive view
* top-bar layout should look good from mobile up

Reviewers: rjmackay, shadowhand

Reviewed By: shadowhand

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

Maniphest Tasks: T858

Differential Revision: https://phabricator.ushahidi.com/D407