first pass at enabling active states in dropdowns in topbar and fixing the bug of having an active class on parent dropdown

merged in my pending changes from 1.2-wip branch, resolve diffs as best as i could, update docs and alerts to use original classes, updated docs to include smaller section for layouts

big update to change the alerts, normal and block level, to have simpler css and new colors independent of the base color scheme

updated docs to fix inconsistent display of code elements, update scaffolding to fix padding issue on fluid containers, add placeholder hero unit in patterns for future use, continue to refactor some rgba to hex values