CON-1542 | Add background logic

Conflicts:
	extensions/wikia/Venus/VenusController.class.php
	extensions/wikia/Venus/styles/grid.scss
	extensions/wikia/Venus/styles/layout.scss
	extensions/wikia/Venus/styles/variables.scss
	extensions/wikia/Venus/templates/VenusController_Index.php
Remove leftover
Cleanup

Conflicts:
	extensions/wikia/Venus/styles/variables.scss