Added

• Add new search navbar modifier to Search component

Changed

• IMPORTANT: Rename `uk-search-navbar` class to `uk-search-medium`
• IMPORTANT: Rename `@search-navbar-` variables to `@search-medium-`
• IMPORTANT: Rename `@inverse-search-navbar-` variables to `@inverse-search-medium-`
• Rename old search navbar modifier to search medium in Search component

Fixed

• Fix clickable search icon not being in natural ordering for sequential focus navigation