Fix the print stylesheets for the web page

[FLamparski]

Since I want to use the webpage at http://flamparski.github.io/areabase as the user manual, I need to get it ready to print and display some index stuff. Quite possibly I will just have to copy it into Publisher or something like that and just print it from there.

Because TRWTF are AQA: mark computing coursework from a paper-only code distribution.

Changes that need to be done:

• Reduce the code font size a bit (but try to keep http://flamparski.github.io/areabase/prettycode.html at 500 pages because why not)
• Print layout for the main page (?):
  • Use columns for printing to not make the images take up two bloody pages
  • Set body { background-color: #FFFFFF; } and then a slightly darker grey for the .jumbotron-section elements

[FLamparski]

A good solution (sass):

@media print
    .highlight
        pre
            line-height: 11pt !important
            span
                font-size: 10pt !important