MAIMING THE CSS

As a designer, I hate dealing with horrible messes. So I made the horrible
mess worse.

* Converted main.css into main.less
* Swapped all colours in main.less to use variables
* Defined default values for ~20 colours in theme/colors/ blue.less
* Dumped a horrible mess of variable expansion into the beginning of main.less
* Also defined some things that I have no idea what the hell they are

No, I don't know how you'd override the default expansions. I didn't think
this through that far.

Change-Id: I6b05a8d982a8acb31b03fac455d1d0f37d6e62db