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header CSS, menu backend system

figuring out menu header CSS. and backend menu update system.

both logo and menu need to be position: absolute;
so header height doesn't change. javascript doesn't have to re-caculate
header height to
push down the content area.

In the backend of Wordpress build a modular fields to add menu logo.
this will make CSS much easier when translate to mobile menu dropdown

better way to code the menu so it picks up external url advanced custom
fields.  I'd like to reduce plugin dependecy