How to export a menu and blocks?
Both menu link items and custom block content are treated as content within Drupal core. That's to say, they aren't covered by the configuration management system. 

In instances where it make sense to have menu link items or custom block content stored in the configuration system, there are modules out there to assist with this:


Fixed block content: Provides a way of having permanent custom content blocks without broken instances if the block does not exist. 
Config menu link: A drop-in replacement for core's Custom Menu Links module.


There many other options to store menu/block data into the config system so it's worth your time to explore other options to find the one that best matches your scenario (especially since Superfish seems to be a part of it).