Add primary menu HOME link as features export, not task #113

Previously, the HOME menu link was added in a task with a special
callback that invoked a single API function.

Now, the menu and menu link are exported as part of the preset. This
way, no callback or API function needs to be used.
Merge pull request #3552 from openscholar/113-export_menu_links

Add primary menu HOME link as features export, not task #113