Remove farm.settings.farm_info menu link.

This is currently the only sub-menu link provided for
settings pages, which is weird. This is a quick fix which
now forces users to click "Settings" to see all the sub-tabs,
instead of thinking there is only one by looking at the
toolbar menu. In a follow-up we may consider providing a
deriver that automatically generates menu links for each
sub-tab so they all show in the toolbar menu. It would be
burdensome to require every module that provides a settings
tab to also add a menu link.

modules/core/settings/farm_settings.links.menu.yml

@@ -11,10 +11,3 @@ farm.settings:
   parent: farm.setup
   route_name: farm_settings.settings_page
   weight: 100
-
-farm.settings.farm_info:
-  title: Farm Info
-  description: Test
-  parent: farm.settings
-  route_name: farm_settings.settings_page
-  weight: -10