ISTWCMS-5631: presentation layer css for menu

Martin Leblancrequested to merge
feature/ISTWCMS-5631-m26lebla-menu-ohana into 1.0.x

ISTWCMS-5631: removing the font size for lists as they get same from body, corrects challenge specificity when using list items in menus, as well as css for chevron at the smaller viewports. CSS linting to the core folder

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