don't markdown for courses page

cos it was more trouble than it was worth - eg. converting indented line to code blocks and more.

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>
style courses page

I rushed this, and used .scss cos I didn't have time to learn the old .sass syntax :(

Signed-off-by: Joshua Paling <joshua.paling@gmail.com>