Splaspage: Add highlights. Fix cfp inclusion.

https://github.com/openSUSE/osem/issues/545

@hennevogel perhaps some ideas for styling? :)
You can't just remove the attribute! You have to migrate it to the splashpage so you should this and 20141127163536_add_include_cfp_in_splashpages.rb alter to one migration and copy the value of cfp to the splashpage!