templates: removed $robots

In 500.latte is <meta name="robots" content="noindex"> needed, because HTTP code may not be send
simplified layout
config.neon: removed own App\RouterFactory service
responsive welcome page
Merge branch 'master' of https://github.com/nette/sandbox

Conflicts:
	app/config/config.neon
	app/templates/@layout.latte
	app/templates/Homepage/default.latte