Refs #370: reduce CSS colour palette by 9 colours
Refs #370: reduce CSS colour palette by another 3 colours
Refs #370: reduce colour palette for hangman game
Refs #370: reduce colour palette for Donează page; move styles to common.css to appear on polar too
Refs #370: remove blue from home page widgets
Refs #370: remove some extra colours on Donează page, tables and Licențe page
Merge pull request #380 from sandriu/ticket370

Refs #370: decrease the colour palette on Zepu skin.