Add unstyled header bar navigation.
Styling header menu.
Styling header menu in flipped state.
Show header bar menu when everything is hidden.
Style header bar menu.
Apply proper text align for different views.
Only show text if header bar menu is not set.
Correctly align header text in flipped view.
Removing letter spacing from menu items. Refs. #157
Styling header bar in narrow view. Refs. #157
Styling header text. Refs. #157
Code style fixes.
Only add header text if menu does not exist.
Merge branch 'header-bar-navigation' into develop

Conflicts:
	src/partials/header-layout-3.php
	src/partials/header-layout.php