Mystery colors

[GarySiu]

It seems like somewhere along the line the yellows in tachyons were mixed up. This is reflected both in the CSS and in the docs: http://tachyons.io/docs/themes/skins/

#FFFF00 should be yellow but has no name/is missing from Tachyons!
#FFD700 should be gold (in line with the CSS keyword) but has been assigned yellow
#FFB700 is some mystery orange variant but assigned gold
#FF6300 is some mystery orange red variant but assigned orange

On the docs page this visually breaks the layout as yellow is unnamed.