whitespace cleanup on _layouts/categories.html
whitespace cleanup on _layouts/post.html
place <h1> and <h2> tags insie of a <div>...still testing
change id name to class name in styles for layout pages

"#site-navigation" changes to ".main-navigation" on grunt/cssSource/_desktopStyles.scss, grunt/cssSource/_globalStyles.scss and grunt/cssSource/_tabletStyles.scss.  This effects the single <nav> tag.