Limit the maximum width of the container to 80ex

The text gets quite hard to read when the line length is much above 80
characters, so limit the width of this section to 80ex.

Update the print styles to use a multi-column layout to take advantage
of available page space.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
New Post:  Issues with Slow Cryptsetup

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>