Add import of home to reintroduce home specific styles

This resolves missing style selector problem when stylesheet refactor removes import of home.css via the layout template
Remove grid `content` on decorative screen shot
Simplify workbook layout during deprecation process

As javascript and stylesheet dependencies are eliminated, avoid
undesirable layout fallout by simply displaying all content of the
workbook
Correct home page heading levels

Corresponds with updated selectors and heading styling to properly
appear in size and use semantic levels.