Permite crear landing de diferentes tipos.

Validacion de problema.
Validacion de Producto (solución)
Validacion o distribución de contenido.
Merge branch 'product_landing_page'

Conflicts:
	app/controllers/landing_page_controller.rb
	app/controllers/lead_controller.rb
	app/views/landing_page/new-validation-content.html.erb
	app/views/landing_page/show-validation-product.html.erb
	db/schema.rb